Flowmaster Muffler Technology Explained
Delta Flow Technology
Developed from Flowmaster's line of Delta Force race mufflers, Delta Flow technology provides superior scavenging of exhaust gases even over a comparable (standard) Flowmaster muffler. By using multiple deflectors, vs. a single deflector, Delta Flow technology provides a cleaner faster scavenging path by eliminating the chance of turbulence commonly found behind a single deflector model. These Delta Flow deflectors can only function properly when they've been precisely placed and welded to exact specifications.
By investing in state-of-the-art electronic sensing devices, Flowmaster can now produce mufflers with internal elements placed at tolerances of +/- .004", twice the standard required by OEM car manufacturers. In fact, no one in the exhaust business today has tighter specifications. If you've ever played a musical instrument or watched a piano tuner at work, you understand how slight the differences are between being in-tune and being out-of-tune. The results are increased horsepower, torque and fuel economy with reductions of exterior sound levels as well as a decrease of interior resonance inside the vehicle. Flowmaster, it's a "Sound Decision."
Delta Force Muffler Race Technology Explained
It has taken years of hard scientific research at Flowmaster's R&D facilities and teamwork with leading race engine builders, top race teams at all levels of motorsports and at racetracks all around the world, to develop Flowmaster's patented race technology. Delta Flow race technology provides superior scavenging of exhaust gases even over a comparable (standard) Flowmaster muffler. By using multiple deflectors, vs. a single deflector, Delta Flow technology provides a cleaner, faster scavenging path by eliminating the chance of turbulence commonly found behind a single deflector model. By using the pressure and sound energy released from an engine's combustion chamber, our designs use the energy to scavenge, or pull, spent gases out of each cylinder more efficiently than even an open pipe system.
This improved removal of exhaust gases out of the cylinders promotes a more efficient charge of unburned fuel and air to fill the cylinder for the next cycle. The result is improved power, as the engine has a purer mixture to burn, and improved fuel economy as less fuel is now required to achieve the same level of performance.
But it's not just the performance gains that make Flowmaster mufflers unique, it's the sound they produce. Our rich exhaust sound is created by Flowmaster's patented noise cancellation system, where exhaust sound energy is split and directed through slightly different paths. Where the paths merge, the two parts of the sound energy are out of phase creating noise cancellation, much as two ripples colliding in a pond absorbing each others energy.
Scavenger D-Port Technology
Flowmaster's unique patented Scavenger Series collectors and cross-over pipes are founded on the principle of PULSE technology. Engines do not work like flow benches by blowing a constant stream of cold air. With an opening point and a closing point of the valves, engines have pulses (a start and an end) of heat, gases and sound frequencies traveling down the exhaust pipes. The large "D-shaped" ports provide a larger surface area for the exhaust pulses to scavenge or pull each other along as they travel the length of the collector. This provides a stronger faster signal resulting in an increased torque curve throughout the RPM range.
OUTLAW Technology Explained
By using sound expansion rings inside the muffler, a low pressure area is created behind each ring helping to accelerate pulses and reducing sound energy as it passes each ring. The result is an increase in torque while taking the edge off of open header applications.
Methanol/Alcohol Technology Explained
Since a large amount of unburned methanol fuel makes its way into the exhaust system and puddles in the low pressure areas of the muffler, patented burn holes are strategically placed in the Methanol/ALC. muffler. This results in a constant flame in those low pressure areas preventing the fuel from igniting and causing a "mini-explosion" when the flame is sucked back into the muffler upon deceleration.
2007-2011 Jeep Wrangler 3.8L V6 - Flowmaster Force II Cat-back System - PN 817514x
1994-2004 Jeep Grand Cherokke - American Thunder Cat-back System - PN 817558x
Flowmaster Muffler Comparisonx
Road Testing Flowmasters New Challenger SRT8 Kitx
Hushpowers WRX Exhaust Kit 819116x
2011 Dodge Charger 3.6L - Flowmaster Force II Cat-back System - PN 817543x
'09-'11 Ford F-150 - Flowmaster American Thunder Series Cat-back Exhaust System 817522x
2007-2011GM 1500 4.8L / 5.3L - Flowmaster Force II Cat-back System - PN 817523x
Flowmaster, Inc. The Exhaust Technology Company
In 1983 California Sprint Car racers were experiencing 'excessive sound' issues at numerous race tracks and were told to quiet the cars down or lose racing privileges. All attempts to silence the race engines without sacrificing power repeatedly failed.
Enter Flowmaster founder, Ray Flugger, with over 45+ years of exhaust design experience, and while working out of a small 800 square foot barn in Kenwood, California, created Flowmaster's first patented design of racing silencers. Ray attached handles to ease carrying the square shaped race mufflers through the race pits, and the mufflers became known as the "suitcase muffler." Today, these innovative Flowmaster mufflers are the result of years of development with top race engine builders, thousands of hours of dyno research and "real-world" on-track testing.
Today, Flowmaster, Inc. is housed in three ultra-modern facilities together totaling over 400,000 sq. ft., one in Santa Rosa, one in West Sacramento, California and the other in Hayden, Idaho. Flowmaster employs over 250+ workers dedicated to building the highest quality U.S. made exhaust products available.
Flowmaster operates the only exhaust Research & Design facility of its kind in the world, centered around our SuperFlow engine dynamometers complete with E.C.A. (engine cycle analysis) equipment and also SuperFlow chassis dynos. Through use of these dynos, Flowmaster's engineering staff can track the complete engine cycle in millionths of a second and can obtain exact technical data of each degree of cam rotation, from induction to the tip of the exhaust system, while also showing the power numbers that really matter, the power numbers "to the ground." Flowmaster also utilizes Spectrum Analyzers to fine "tune" the sound of each of the eleven different series of mufflers that Flowmaster currently offers, both for peak performance and just the right sound levels and tones.
Flowmaster's product line includes exhaust products for Performance Street, Muscle Cars, Trucks, Street Rods, RV's, Motorhomes, and all types of race applications. With over 400 different muffler models, 370+ exhaust systems and numerous exhaust accessories available, Flowmaster offers you the choice of sound to fit your preference from "wild to mild" and your specific vehicle needs. Call our experienced tech staff for live help and detailed information regarding your vehicle.
With Ray still active and "hands on" with the R&D department in the development of new exhaust products and new technologies currently being tested, the future looks to be very exciting indeed.
Frequently Asked Questions
- What makes Flowmaster mufflers different?
- How does Flowmaster compare to straight thru mufflers?
- How do Flowmaster mufflers rate on a flowbench (CFM)?
- What does a Flowmaster sound like?
- What is the difference between a 40 series and a 50 series muffler?
- How do I select the correct Flowmaster muffler?
- Will I lose power going from a 40 series to a 50 series, or to a 70 series?
- What is "Delta Flow" technology?
- What is Hushpower?
- What kind of performance gains can I expect when installing a Flowmaster system on my vehicle?
- I don?t see what I need in your catalog. Can you custom build what I need?
- What size exhaust tubing should I use for my street application?
- Do I need to install an "H" pipe in my dual exhaust system?
- Is an "X" pipe better than and "H" pipe?
- Will my late model vehicle run better if I replace the single inlet muffler with a true dual exhaust system?
- Do I need to run tailpipes after the mufflers?
- What is Flowmaster's warranty?
- How can I be sure that I'm buying a Flowmaster muffler?
- What materials are used to build Flowmaster mufflers?
- Is Stainless Steel, a better material for manufacturing exhaust products than Aluminized Steel?
- Will installing a Flowmaster cat-back exhaust system void my vehicle?s factory warranty?
- Are Flowmaster Performance cat-back exhaust systems and mufflers street legal?
The Flowmaster Advantage
Flowmaster vs. "straight-through" muffler designs
"Straight-through" muffler designs utilize a packing material wrapped around a piece of perforated tubing to absorb sound as its traveling through the muffler. This internal tubing is generally reduced as it enters the inlet of the muffler to help achieve a further reduction of sound as its exiting the muffler, smaller hole, less sound. At the same time this creates a further restriction for hot exhaust gases traveling through the mufflers.
Why should I buy a Flowmaster?
- Since Flowmaster mufflers use sound energy cancellation technology, you don't have to worry about "packing material" deteriorating and getting louder after as little as a few months.
- The interior case volume of the inside of a Flowmaster muffler is far superior to that of a "straight-pipe" or "straight-through" muffler design. Imagine filling a "straight-pipe" or "straight-through" muffler with water vs. filling a Flowmaster muffler with water. Which one do think would hold substantially more volume?
- The deflector in a Flowmaster muffler acts as a one way check valve eliminating reversion back to the engine and creates a low pressure area to help scavenge the exhaust.
- Flowmasters unique style of H-Chamber designs help control interior resonance inside the cab area of your vehicles. "Straight-through" muffler designs cannot.
- Flowmasters use fully welded construction for added strength and durability to last even when installed on high horsepower engines.
- Flowmaster mufflers are made in the U.S.A
Flowmaster's staff is out attending events throughout the year to interact with, and answer questions for our customers. Our display trucks and trailers can be seen at numerous Automotive events displaying cutaways of the latest in muffler technology, bolt-on exhaust systems for most popular applications and exhaust accessories. Stop by and pick up the latest catalogs, literature and decals all at no cost to you and talk to one of our on-site exhaust experts who are there to answer your Flowmaster exhaust questions.
The display trucks are Ford F650 SuperCrewzers which feature 300hp CAT engines, Allison six speed automatic transmissions, all leather interior, custom bed with diamond plate and custom wheels. And of course these trucks are outfitted with our Hushpower Pro series mufflers!
The display trucks are Ford F650 SuperCrewzers which feature 300hp CAT engines, Allison six speed automatic transmissions, all leather interior, custom bed with diamond plate and custom wheels. And of course these trucks are outfitted with our Hushpower Pro series mufflers!
The trailers are all-aluminum 48' smooth sided trailers with a pop-out lounge/meeting area, 10 ft interior ceilings, custom storage cabinets, electric canopies, "versa trak" tie-down floors, triple 8k lb. axles with air ride suspension and custom wheels.
For over 25 years Flowmaster has a proven history of providing the most technologically advanced and highest quality exhaust products in the world. But don't just take our word for it, click on the links below to hear what our customers have to say.
Street Performance Mufflers
The "Flowmaster Sound" is the true tone of American muscle and performance. Available in a wide range of domestic and import applications for automobiles and trucks, Flowmaster products consistantly produce more power and better mileage than Original Equipment (OE) and competitive aftermarket products.
What makes Flowmaster products so unique is that their performance improvements are paired with the unmistakable sound they provide. The "Flowmaster Sound" is offered in many levels depending upon the muffler series. From the deep, aggressive tone of the Super 44 to the quiet and subtle, but unmistakably rich Flowmaster tone of the 70 Series, our family of mufflers offer the right application of performance and sound you want. Often imitated but never duplicated, don't settle for anything less! We're proud to say that we manufacture our products right here in the USA.
50 Series Big Block - Three Chamber MufflersThe 50 Series Big Block Muffler is our largest and quietest muffler made for tow vehicles, full-size trucks, large SUV's and RV's / Motorhomes. This muffler is made for more than just big cubic inch engine applications and has a very large Resonance Tuning Chamber to almost completely reduce interior resonance in large cab vehicles and enough case volume to handle engines under heavy loads. Significant improvements in mileage, torque, and horsepower are to be expected from this muffler, as well as decreased engine heat and wear. Available in 16-gauge aluminized steel and fully MIG-welded for maximum durability. 5 Thick x 12" Wide x 22" Long with inlet/outlet sizes of 3" and 3.5". Click on image for sizes and full part number.
70 Series Big Block II - Three Chamber MufflersThe 70 Series Big Block II Muffler uses a longer case for increased volume and added sound reduction that will still fit many applications that our wider 50 Series Big Block muffler won't fit. It utilizes Flowmaster's patented Delta Flow Technology for maximum efficiency and minimum interior resonance. The 70 Series mufflers are perfect for high performance street cars, most trucks, SUV's, RVs and tow vehicles that require quiet operation with improved sound. Constructed of 16-gauge aluminized steel and fully MIG-welded for maximum durability. 5" Thick x 10" Wide x 22" Long with inlet/outlet sizes from 2.25" up to 3". Click on image for sizes and full part number listing.
Super 50 (SUV) - Three Chamber MufflersThe Flowmaster Super 50 Series (SUV) Muffler incorporates an increased case size with the technology from the 50 Series Delta Flow muffler. Made for all SUV's and large displacement engine vehicles, the Super 50 Series larger case size allows for optimum exhaust flow, increased mileage, and reduced interior resonance. Also excellent for use on full-sized, high performance street cars looking to reduce interior resonance and tone levels for everyday driving. Constructed of 16-gauge aluminized steel and fully MIG-welded for maximum durability. 5" Thick x 10" Wide x 17" Long with inlet/outlet sizes from 2.25" up to 3". Click on image for sizes and full part number listing.
60 Series Delta Flow - Three Chamber MufflersAll 60 Series Mufflers feature Delta Flow Technology to increase horsepower and torque in most four and six cylinder vehicles. The 60 Series mufflers have shown significant improvements in mileage, helping to save fuel on many commuter vehicles, the mellow tone making for a pleasant and quiet driving experience. Just by adding a larger diameter tailpipe and Flowmaster stainless tip you can create a deeper tone overall inside and out. Constructed of 16-gauge aluminized steel and fully MIG-welded for maximum durability. 5" Thick x 10" Wide x 13" Long with inlet/outlet sizes of 2" and 2.25". Click on image for sizes and full part number listin.
50 Series HD - Three Chamber MufflersThe 50 Series Heavy Duty Muffler is appropriately named, a tough customer just like the trucks it was designed for. With 4.00? internal components and large case size, these mufflers help to significantly increase mileage, torque, and horsepower while greatly improving towing power and acceleration. The 50 Series Heavy Duty is great for all gas and diesel applications, and late-model trucks used in the most extreme working conditions. Constructed of 16-gauge aluminized steel and fully MIG-welded for maximum durability.5" Thick x 10" Wide x 18" Long with inlet/outlet sizes from 3" up to 4". Click on image for sizes and full part number listing.
HP-2 Series - Laminar Flow MufflersThe Hushpower HP-2 Performance Muffler is a real hot rod muffler that delivers all the required benefits of a high performance street and race muffler, yet is small enough for street rod applications. Built from either 409S or 304S stainless steel, this smooth, stylish muffler can be polished or coated for a great looking finish. The HP-2 muffler is designed for use with street rods, customs, low riders and sport trucks or industrial applications where heat control and space are an issue. The HP-2 mufflers feature an innovative "Cool Shell" casing, a key feature in contributing to the muffler's sound and heat control design. Advanced ?flow? technology produces broadband sound cancellation for a rich '50's tone. The HP-2 mufflers use a 4.00" X 5.50" X 18.00 CASE and can be ordered with inlet/outlet diameters including 2.00?, 2.25? and 2.50?. (Shorty models with a 12" long case are also available).
50 Series Delta Flow - Three Chamber MufflersGreatly reduced interior resonance, smaller case size, and moderate exterior tone are just some of the benefits to the 50 Series Delta Flow Mufflers. With a specially designed Resonance Tuning Chamber, the 50 Series Delta Flow gives all the performance, while reducing the tone inside and outside of your vehicle. Simply stated, it delivers the same great performance from Flowmaster, without the increased sound. Available in Aluminized Steel or 409S Stainless for harsh weather applications, and both are fully MIG-welded for maximum durability. 4" Thick x 9.5" Wide x 17" Long with inlet/outlet sizes from 2" up to 3". Click on image for sizes and full part number listing.
50 Series 4x8 - Three chamber MufflersThis narrow version of our street three chamber design utilizes Flowmaster's patented Delta Flow technology along with an internal tuning chamber to reduce sound inside the vehicle. Perfect for narrow frame vehicles like early Jeeps and german imports that are difficult to fit standard bodied mufflers. Available in 16-gauge aluminized steel and fully MIG-welded for maximum durability. 4" Thick x 8" Wide x 15" Long with inlet/outlet sizes of 2" and 2.25". Click on image for sizes and full part number listing.
40 Series Delta Flow - Two Chamber MufflersDesigned to minimize interior resonance, the 40 Series Delta Flow Muffler offers an aggressive exterior tone. The 40 Series Delta Flow helps increase torque and horsepower on many late-model performance cars and trucks. Available in Aluminized and 409S Stainless for harsh weather applications, both are fully MIG-welded for maximum durability. 4" Thick x 9.5" Wide x 13" Long with inlet/outlet sizes from 2" up to 3". Click on image for sizes and full part number listing.
Super 40 - Two Chamber MufflersThe Super 40 Muffler was developed from our Top Ten race muffler lineup for use on the street and strip. Utilizing Delta Flow Technology, this muffler gives the best performance to higher horsepower vehicles. The Super 40 features a black, oversize case, which keeps the resonance down while the deep outside tone says it's a Flowmaster! Constructed of 16-gauge aluminized steel and fully MIG-welded for maximum durability. 5" Thick x 10" Wide x 13.5" Long with inlet/outlet sizes from 2.25" up to 3". Click on image for sizes and full part number listing.
50 Series 3x10 - Three Chamber MufflersThis ultra thin version version of our three chamber design utilizes Flowmaster's patented Delta Flow technology to help keep things quiet. Designed originally for the 70's GM F-bodies, these mufflers are perfect for vehicles where ground clearance is a major concern. Available in 16-gauge aluminized steel and fully MIG-welded for maximum durability. 3" Thick x 10" Wide x 16" Long with inlet/outlet size of 2.5". Click on image for sizes and full part number listing.
40 Series Classic - Two Chamber MufflersThese are duplications Ray Fluggers original square "Suitcase" mufflers that started it all. Built in a limited quantity of 1000 units, each is signed and numbered by Ray himself. Hand crafted and formed with the original tooling that was found in storage after 25 years. Unlike the originals however, these units are constructed with 409S stainless steel to last a lifetime. This is a special opportunity to own a piece of history. The square case with its wider profile produces an extra deep tone that many will recall as being "Like the ones I had when I was a kid"
Original 40 Series - Two Chamber MufflersThese are duplications Ray Fluggers original square "Suitcase" mufflers that started it all. Built in a limited quantity of 1000 units, each is signed and numbered by Ray himself. Hand crafted and formed with the original tooling that was found in storage after 25 years. Unlike the originals however, these units are constructed with 409S stainless steel to last a lifetime. This is a special opportunity to own a piece of history. The square case with its wider profile produces an extra deep tone that many will recall as being "Like the ones I had when I was a kid"
Super 44 - Two Chamber MufflersFlowmaster's Super 44 Muffler uses the same Delta Flow Technology found in our larger Super 40 mufflers. The Super 44 delivers a powerful rich tone and is the most aggressive, deepest sounding, highest performing four-inch case street muffler we've eve built! Constructed from 16-guage aluminized or 409S Stainless Steel and fully MIG-welded for maximum durability. 4" Thick x 9.5" Wide x 13" Long with inlet/outlet sizes from 2" up to 3". Click on image for sizes and full part number listing.
80 Series - Cross Flow MufflersFor True Dual exhaust performance where only a single exhaust system will fit such as is commonly found in classic Camaros and Firebirds, the 80 Series Cross-Flow Muffler fits transversely behind the rear axle and in front of the fuel tank, the OE placement. With single or dual inlets, the 80 Series gives excellent ground clearance, aggressive tone and dual outlets to fit muscle cars requiring this specialized fitment. Constructed of 16-gauge aluminized steel and fully MIG-welded for maximum durability. Click on image for sizes and full part number listing.
Super 10 Series - One Chamber MufflersSingle Chamber mufflers. Intended for customers who desire the loudest and most aggressive sound they can find. Because these mufflers are so aggressive, they are recommended only for off highway use and not for street driven vehicles. These mufflers utilize the same patented Delta Flow technology that is found in Flowmaster's other Super series mufflers to deliver maximum performance. Constructed of 16-gauge 409S stainless steel and fully MIG-welded for maximum durability.
Performance Exhaust Systems
Flowmaster exhaust systems and exhaust kits are unmatched in the industry in terms of fit, quality and performance. Our Force II exhaust systems are available for those who are looking for maximizing performance but with a mild, subdued tone that won't wake the neighbors. For those who want their beast to be heard, there's our American Thunder series. Available in Cat-Back, Axle-Back and Header-Back configurations, there is a system that will fit your needs.
True-Dual Exhaust SystemsOur True-Dual, Header-Back and Cat-Back systems are built with maximum performance and aggressive looks in mind. These systems gererally follow the factory routing and utilize OEM hanger locations when possible. These systems are mandrel bent for maximum performance and include specially selected mufflers for just the right performance and sound. Available in the aggressive American Thunder series as well as the quieter Force II series, and like all Flowmaster systems, the benefits include improved throttle response, power and mileage. Designed for an easy fit, these systems include everything you need to complete the installation for an incredible performance look and sound.
Axle-Back Exhaust SystemsThese systems are designed to replace original rear mounted mufflers located behind the rear axle using factory style connections. With easy fit in mind, these systems are mandrel bent for maximum performance and include specially selected mufflers. Available in the aggressive American Thunder series as well as the quieter Force II series. Like all Flowmaster systems, the benefits include improved throttle response, power and mileage. Designed for an easy fit, these systems include all necessary parts and hardware for easy installation.
Split-Dual Exit Exhaust SystemsFor the person who wants the look of a traditional dual exhaust system with all the benefits that a Flowmaster cat-back exhaust system provides. D.O.R./D.O.S. systems are the perfect choice, and include exit pipes for both Dual Out Rear and Dual Out side configurations so that you can choose the one that fits your style. Available in the aggressive American Thunder series as well as the quieter Force II® series. Like all Flowmaster systems, the benefits include improved throttle response, power and mileage. Designed for an easy fit, these systems include all necessary parts and hardware for easy installation.
Single Exit Exhaust SystemsThese single outlet systems are for the person who wants a subdued, but custom look, with all the benefits of a Flowmaster exhaust system. Available in the mellow Force II series as well as the more aggressive American Thunder series. These systems feature mandrel bent 16 gauge tubing, either weld-on or flanged inlet pipe/pipes, specially tuned muffler, clamps, hangers and a stainless steel exhaust tip exiting in the factory location.
Muscle Truck Exhaust SystemsThese systems are designed to give your late model truck the custom look of a NASCAR race truck. These "Muscle Truck" systems feature mandrel bent tubing custom bent and fixtures to fit your vehicle, either weld-on or flanged inlet pipe/pipes, specially tuned muffler, clamps, hangers and stainless steel exhaust tips exiting in front of the rear wheel for that aggressive look and sound of a dual exhaust race vehicle.
U-Fit Universal KitsThe new U-Fit dual pipe kits come complete with all the pipes you need to build a custom dual exhaust system in 2.25, 2.50 and 3.00-inch pipe diameters. Click on the image for more information on these products.
25+ Years of Race Winning Technology and counting!
Our original Flowmaster technology was born on the racetrack over 25 years ago to create a sound solution for Sprint cars racing at local California fairgrounds events. Our patented new and innovative technology not only resolved the excessive sound issues of these high-powered race cars, but also allowed maximum horsepower with an increased and broader torque curve - an unheard of byproduct from competitive mufflers in use at the time.
Our highly devoted R&D works department actively searches for new challenges to resolve, and constantly working with leading race teams, engine builders and race organizations to name a few, in the quest in improving and developing new technologies. Were focused on developing greener more positive solutions to keep racing safe for all participants, fans and neighbors, while achieving the ultimate goal...Winning!
No other muffler company has dominated racetracks around the world like Flowmaster has in the past, present, or will in the future. That?s our pledge to you. We feel we can make that statement since we earn it everyday with our non-stop drive to offer the best products available.