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GMC K25 Exhaust System

We have 4 Items In-stock. Select a year to continue.
$333.20 List Price $578.96 Save $245.76 Availability: In Stock
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GIBSON – SWEPT SIDE CAT-BACK EXHAUST SYSTEMS

Gibson’s Swept Side cat-back exhaust system is dyno-proven to dramatically increase the power band in the 1800-3000 RPM range, giving you more horsepower, torque, fuel economy and towability with a rich, deep exhaust tone. Gibson is known as the leading manufacturer of street-legal, high performance exhaust systems for trucks, SUVs, diesels, off-road vehicles and RVs.

  • Gibson’s most popular, affordable and leading performance exhaust system
  • Stainless steel exhausts backed by a lifetime warranty
  • Patented Superflow technology means dramatically more efficient exhaust flow
  • Optimizes towing power, hill climbing and passability
  • Comes in aluminized or stainless steel
  • Proven to improve torque, horsepower (up to 20 hp) and gas mileage
  • Mandrel-bent tubing allows for continuous airflow
  • Polished stainless tips feature sleek clampless connection
  • Dyno-tested
  • Direct fit by vehicle year, make and model
  • Made in America
  • Legal in all 50 states
  • SKU#: G27315566
  • Brand: Gibson
  • Fit Note: 96.0 in. Bed, Standard Cab Pickup
  • Quantity Sold: Assembly
  • Muffler Sound Level: Moderate to Aggressive
  • Recommended Use: Performance
  • Advertised Power Gains: 15-20 h.p.
  • Anticipated Ship Out Time: 2-3 business days
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Fits the following GMC K25 Years:
  • 1978 | 8 Cyl 5.7L | Base, High Sierra, Sierra Classic, Sierra Grande
  • 1977-1978 | 8 Cyl 5.0L | Base, High Sierra, Sierra Classic, Sierra Grande
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$255.23 List Price $301.17 Save $45.94 Availability: In Stock
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Heartthrob True Dual Exhaust System

With the Heartthrob True Dual Exhaust System, your truck will surely show its true potential. With this exhaust system, back pressure will be minimized resulting to significant power gains from your engine. This is the result of Heartthrob putting up mandrel-bent tubing that has larger diameter compared to the stock system coupled by your choice of glass pack, stock or no muffler at all to satisfy your ears. This exhaust system is wrapped up with aluminized steel that exhibits pure durability. The Heartthrob True Dual Exhaust System will surely make you enjoy your car like never before.

  • Fabricated with 16 gauge aluminized steel
  • CNC mandrel-bent tubing for fast flowing exhaust
  • Rear-exit or side sweep style tail exit
  • Choice of turbo, HVS muffler or no muffler at all
  • Perfect fit for your year, model and make
  • Complete with all hardware needed for installation
  • Backed by a 1 Year Warranty

For off road use - Not legal for use on public roads and highways

Specifications:

  • Header-back system
  • Dual exit, split side
  • 2.25 in. piping diameter
  • Pipes, mounting hardware included
  • Muffler not included
  • Fits vehicles with stock manifold
  • SKU#: HEA8148040
  • Brand: Heartthrob Exhaust
  • Fit Note: Extended Cab Pickup, 4WD, small block, up To 132 in. Wheelbase, greater than 132 in. longer extensions are required., Standard Cab Pickup, 4WD, small block, up To 132 in. Wheelbase, greater than 132 in. longer extensions are required.
  • Emissions: For off road/track use
  • Quantity Sold: Assembly
  • Muffler Sound Level: No Muffler
  • Recommended Use: Performance
  • Anticipated Ship Out Time: 1-2 Business Days
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Fits the following GMC K25 Years:
  • 1977-1978 | 8 Cyl 5.0L | Base, High Sierra, Sierra Classic, Sierra Grande
  • 1975-1978 | 8 Cyl 6.6L | Base, High Sierra, Sierra Classic, Sierra Grande
$300.10 List Price $607.40 Save $307.30 Availability: In Stock
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DYNOMAX – THRUSH EXHAUST SYSTEMS

Dynomax’s Thrush Headerback Exhaust System will not only boost your image with its turbo mufflers, but is proven to dramatically increase your vehicle’s power and performance with style and a deep, cool tone that’ll make your hot rod stand out – and impress your friends. Dynomax is a world leader in the performance exhaust space, manufacturing products held to the highest engineering standards and backed by extensive research and development.

  • Specifically designed for classics/hot rods
  • Made to be used with full-length headers
  • Most systems Include two vintage-style Thrush mufflers and smooth bent 2 ½ inch aluminized exhaust pipes
  • Most systems comes with an H-pipe balance tube
  • More cost-effective than comparable exhausts for classic vehicles
  • High-flow Thrush mufflers feature spun-locked heads and reversible chambers
  • Includes all necessary hardware
  • Stock tailpipe exit design
  • SKU#: D2289024
  • Brand: Dynomax
  • Fit Note: 96.0 in. Bed, Standard Cab Pickup, 4WD, Headers With Air Injection Fittings For PN[85503], Used With PN[85003/86003/85503/85089/86089], 96.0 in. Bed, Standard Cab Pickup, 4WD, Used With PN[85003/86003/85503/85089/86089]
  • Quantity Sold: Assembly
  • Muffler Sound Level: Moderate
  • Recommended Use: Performance
  • Anticipated Ship Out Time: 1-2 Business Days
  • Attachment Style: Clamp-On
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Fits the following GMC K25 Years:
  • 1976-1978 | 8 Cyl 7.4L | Base, High Sierra, Sierra Classic, Sierra Grande
  • 1975-1978 | 8 Cyl 6.6L | Base, High Sierra, Sierra Classic, Sierra Grande
$218.65 List Price $258.01 Save $39.36 Availability: In Stock
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Hooker Competition Exhaust System is designed to fit Hooker Competition headers or manifolds. It features large diameter, mandrel-bent, and 16-gauge aluminized steel tubing for improved efficiency, less back-pressure, maximum flow, and longer life.

Note:

    Specifications:

    • Header-back system
    • Dual split side exit
    • 2.25 in. piping diameter
    • Pipes, mounting hardware included
    • Muffler not included; Designed for used with Hooker Competition Headers PN 2453HKR; Modifications required if used with other headers
  • SKU#: H2616526
  • Brand: Hooker
  • Fit Note: 96.0 in. Bed, Extended Cab Pickup, 96.0 in. Bed, Standard Cab Pickup
  • Quantity Sold: Kit
  • Muffler Sound Level: Not Specified
  • Recommended Use: Performance
  • Anticipated Ship Out Time: 1-2 Business Days
  • Attachment Style: Clamp-On
(see more)
Fits the following GMC K25 Years:
  • 1977-1978 | 8 Cyl 5.0L | Base, High Sierra, Sierra Classic, Sierra Grande
  • 1975-1978 | 8 Cyl 6.6L | Base, High Sierra, Sierra Classic, Sierra Grande