Shopping outside the US? International Shipping is now available!

×

APW Part Finder

Shop by Brand

Shop by Price

Shop by Location

Shop by Product Fit

Shop by Quantity Sold

Shop by Tube Material

COLLAPSE ALL

Catalytic Converter for 1978 Mercedes Benz 450SEL

We have 11 Items In-stock. Select your vehicle's Submodel to continue.

Magnaflow 49-State Legal Semi-Universal Catalytic Converter

  • Not legal for use in California or in states adopting the California emissions standards
  • Semi-universal design – cut out your old catalytic converter and weld in the new one
  • Stainless Steel Construction
  • Legendary Magnaflow quality, power, and sound
  • Ceramic, honeycomb catalyst designed for maximum flow and surface area

When you want the best, you want Magnaflow!  These 49-State Legal semi-universal catalytic converters have a catalyst specifically designed for your vehicle – just cut out your old catalytic converter and weld in the new one.  Engineered to cut emissions and improve performance.

Magnaflow 49-State Semi-Universal Driver Or Passenger Side Catalytic Converter - Traditional Converter, Semi-Universal

Best Seller
$99.38 $128.61 You Save $29.23 (23%)
Add to Cart
Availability: In Stock
Only from APW Rewards
  • Brand SKU#: Magnaflow 94008
  • Location: Driver Or Passenger Side
  • Series: Magnaflow 49-State Semi-Universal
  • Type: Traditional Converter
  • Emissions: 48-State Legal (Cannot Ship to CA or NY)
  • Product Fit: Semi-Universal
  • Quantity Sold: Sold Individually
  • Tube Material: Stainless Steel
  • Anticipated Ship Out Time: 1-2 Business Days
  • Dimensions: 13.38 in. body length, 7 in. width, 17.38 in. overall length
  • Warranty: Magnaflow 25,000 Mile Limited Warranty
See more

Fits the following 1978 Mercedes Benz 450SEL Submodels

  • 8 Cyl 4.5L | Base
See more
Customer Review: (see review/s)
  • Installed this cat on a 95 BMW 325i. The spacing of the pipe centers was off a little had to make it work by filling in welds and bending the pipes a little. It fit well in the space provided undercar and the car did pass emissions after.

    posted by: on March 6, 2015

  • view all 2 reviews

Magnaflow California Legal Semi-Universal Catalytic Converter

  • 50-State/California Legal
  • Semi-universal design – cut out your old catalytic converter and weld in the new one
  • Stainless Steel Construction
  • Legendary Magnaflow quality, power, and sound
  • Ceramic, honeycomb catalyst designed for maximum flow and surface area

When you want the best, you want Magnaflow!  These semi-universal 50-State Legal catalytic converters have a catalyst specifically designed for your vehicle – just cut out your old catalytic converter and weld in the new one.  Engineered to cut emissions and improve performance.

Magnaflow 50-State Semi-Universal Driver Or Passenger Side Catalytic Converter - Traditional Converter, Semi-Universal

$184.75 $239.09 You Save $54.34 (23%)
Add to Cart
Availability: In Stock
Only from APW Rewards
  • Brand SKU#: Magnaflow 332004
  • Location: Driver Or Passenger Side
  • Series: Magnaflow 50-State Semi-Universal
  • Type: Traditional Converter
  • Emissions: 50-State Legal
  • Product Fit: Semi-Universal
  • Quantity Sold: Sold Individually
  • Tube Material: Stainless Steel
  • E O Number: D-193-117
  • Anticipated Ship Out Time: 1-2 Business Days
  • Notes: Inlet/Outlet Size : 2in. I.D.
  • Warranty: Magnaflow 25,000 Mile Limited Warranty
See more

Fits the following 1978 Mercedes Benz 450SEL Submodels

  • 8 Cyl 4.5L | Base
See more

Magnaflow 50-State Semi-Universal Driver Or Passenger Side Catalytic Converter - Traditional Converter, Semi-Universal

Best Seller
$184.75 $239.09 You Save $54.34 (23%)
Add to Cart
Availability: In Stock
Only from APW Rewards
  • Brand SKU#: Magnaflow 332005
  • Location: Driver Or Passenger Side
  • Series: Magnaflow 50-State Semi-Universal
  • Type: Traditional Converter
  • Emissions: 50-State Legal
  • Product Fit: Semi-Universal
  • Quantity Sold: Sold Individually
  • Tube Material: Stainless Steel
  • E O Number: D-193-117
  • Anticipated Ship Out Time: 1-2 Business Days
  • Notes: Inlet/Outlet Size : 2.25in. I.D.
  • Warranty: Magnaflow 25,000 Mile Limited Warranty
See more

Fits the following 1978 Mercedes Benz 450SEL Submodels

  • 8 Cyl 4.5L | Base
See more

Magnaflow 50-State Semi-Universal Driver Or Passenger Side Catalytic Converter - Traditional Converter, Semi-Universal

$184.75 $239.09 You Save $54.34 (23%)
Add to Cart
Availability: In Stock
Only from APW Rewards
  • Brand SKU#: Magnaflow 332006
  • Location: Driver Or Passenger Side
  • Series: Magnaflow 50-State Semi-Universal
  • Type: Traditional Converter
  • Emissions: 50-State Legal
  • Product Fit: Semi-Universal
  • Quantity Sold: Sold Individually
  • Tube Material: Stainless Steel
  • E O Number: D-193-117
  • Anticipated Ship Out Time: 1-2 Business Days
  • Notes: Inlet/Outlet Size : 2.5in. I.D.
  • Warranty: Magnaflow 25,000 Mile Limited Warranty
See more

Fits the following 1978 Mercedes Benz 450SEL Submodels

  • 8 Cyl 4.5L | Base
See more

Walker - OE Replacement Catalytic Converters (50-State Legal)

WALKER - OE REPLACEMENT CATALYTIC CONVERTERS (50-STATE LEGAL)

Optimize your vehicle’s emissions control with the premium steel design and CARB-approved performance of Walker's OE replacement catalytic converters. Established in 1908, Walker is renowned in the automotive aftermarket for manufacturing a full line of exhaust system parts.

  • Engineered with higher loaded substrate
  • Premium stainless steel design
  • No trouble to bolt on
  • Equipped with OE-style flanges, hangers and brackets

Notes:

  • CARB-compliant/legal in 50 states - for sale and use in New York and California; can be shipped to addresses in New York and California.

Walker CalCat Center Catalytic Converter - Traditional Converter, Semi-Universal

$146.67 $310.86 You Save $164.19 (53%)
Add to Cart
Availability: In Stock
Only from APW Rewards
  • Brand SKU#: Walker 80828
  • Location: Center
  • Series: Walker CalCat
  • Type: Traditional Converter
  • Emissions: 50-State Legal
  • Product Fit: Semi-Universal
  • Quantity Sold: Sold Individually
  • Tube Material: Stainless Steel
  • E O Number: D-182-54
  • Anticipated Ship Out Time: Same day - 1 business day
  • Warranty: 5-year or 50,000-mile Walker limited warranty
See more

Fits the following 1978 Mercedes Benz 450SEL Submodels

  • 8 Cyl 6.8L | 6.9
See more

Walker CalCat Driver Or Passenger Side Catalytic Converter - Traditional Converter, Semi-Universal

$146.67 $310.86 You Save $164.19 (53%)
Add to Cart
Availability: In Stock
Only from APW Rewards
  • Brand SKU#: Walker 80822
  • Location: Driver Or Passenger Side
  • Series: Walker CalCat
  • Type: Traditional Converter
  • Emissions: 50-State Legal
  • Product Fit: Semi-Universal
  • Quantity Sold: Sold Individually
  • Tube Material: Stainless Steel
  • E O Number: D-182-54
  • Anticipated Ship Out Time: Same day - 1 business day
  • Warranty: 5-year or 50,000-mile Walker limited warranty
See more

Fits the following 1978 Mercedes Benz 450SEL Submodels

  • 8 Cyl 4.5L | Base
See more

Walker - OE Replacement Catalytic Converters (48-State Legal - No CA, No NY)

WALKER - OE REPLACEMENT CATALYTIC CONVERTERS (48-STATE LEGAL - NO CA, NO NY)

Walker's OE replacement catalytic converters are rigorously engineered to deliver a perfect fit and optimal performance. Established in 1908, Walker is renowned in the automotive aftermarket for manufacturing a full line of exhaust system parts.

  • Higher loaded substrate
  • Engineered with premium stainless steel
  • Simply bolts on
  • Features thick, OE-quality hangers, flanges and brackets

Notes:

  • Non-CARB compliant/48-state legal - not for sale or use in New York or California; cannot be shipped to New York or California addresses.

Walker Standard Catalytic Converter - Traditional Converter, Semi-Universal

$114.60 $135.23 You Save $20.63 (15%)
Add to Cart
Availability: In Stock
Only from APW Rewards
  • Brand SKU#: Walker 15145
  • Series: Walker Standard
  • Type: Traditional Converter
  • Emissions: 48-State Legal (Cannot Ship to CA or NY)
  • Product Fit: Semi-Universal
  • Quantity Sold: Sold Individually
  • Tube Material: Stainless Steel
  • Anticipated Ship Out Time: Same day - 1 business day
  • Dimensions: 18 in. overall length
  • Notes: Without Air Tube
  • Warranty: 5-year or 50,000-mile Walker limited warranty
See more

Fits the following 1978 Mercedes Benz 450SEL Submodels

  • 8 Cyl 6.8L | 6.9
See more

Benchmark - OE Replacement Catalytic Converters (48-State Legal - No CA, No NY)

BENCHMARK - OE REPLACEMENT CATALYTIC CONVERTERS (48-STATE LEGAL - NO CA, NO NY)

Benchmark's OE replacement catalytic converters set the industry standard in terms of fitment and durability. Their performance is closely monitored and backed by Benchmark's emissions laboratory, ensuring quality loadings that eliminate OBDII issues caused by many universal catalytic converters.

Notes:

  • 48-state legal - cannot be shipped to New York or California; not for sale or use in New York or California.

Benchmark Driver Side Catalytic Converter - Traditional Converter, Direct Fit

$276.76 $925.00 You Save $648.24 (70%)
Add to Cart
Availability: In Stock
Only from APW Rewards
  • Brand SKU#: Benchmark 82219
  • Location: Driver Side
  • Type: Traditional Converter
  • Emissions: 50-State Legal
  • Product Fit: Direct Fit
  • Quantity Sold: Assembly
  • Tube Material: Aluminized Steel
  • E O Number: D-193-84
  • Anticipated Ship Out Time: 1-2 Business Days
  • Warranty: 5-year or 50,000-mile Benchmark limited warranty
See more

Fits the following 1978 Mercedes Benz 450SEL Submodels

  • 8 Cyl 4.5L | Base
See more

Benchmark Passenger Side Catalytic Converter - Traditional Converter, Direct Fit

$276.76 $925.00 You Save $648.24 (70%)
Add to Cart
Availability: In Stock
Only from APW Rewards
  • Brand SKU#: Benchmark 82220
  • Location: Passenger Side
  • Type: Traditional Converter
  • Emissions: 50-State Legal
  • Product Fit: Direct Fit
  • Quantity Sold: Assembly
  • Tube Material: Aluminized Steel
  • E O Number: D-193-84
  • Anticipated Ship Out Time: 1-2 Business Days
  • Warranty: 5-year or 50,000-mile Benchmark limited warranty
See more

Fits the following 1978 Mercedes Benz 450SEL Submodels

  • 8 Cyl 4.5L | Base
See more

Benchmark Passenger Side Catalytic Converter - Traditional Converter, Direct Fit

$276.76 $925.00 You Save $648.24 (70%)
Add to Cart
Availability: In Stock
Only from APW Rewards
  • Brand SKU#: Benchmark 82243
  • Location: Passenger Side
  • Type: Traditional Converter
  • Emissions: 50-State Legal
  • Product Fit: Direct Fit
  • Quantity Sold: Assembly
  • Tube Material: Aluminized Steel
  • E O Number: D-193-84
  • Anticipated Ship Out Time: 1-2 Business Days
  • Warranty: 5-year or 50,000-mile Benchmark limited warranty
See more

Fits the following 1978 Mercedes Benz 450SEL Submodels

  • 8 Cyl 6.8L | 6.9
See more

Need Help? Get everything right and save time

Shop 1978 Mercedes Benz 450SEL Catalytic Converter or call our auto parts experts at or get an expert recommendation via Live Chat

Our Advantage

Free Shippingon orders $50 and above

Copyright ©1995-2015 Auto Parts Warehouse. All Rights Reserved.
Please read Auto Parts Warehouse's Updated Privacy Policy

Hide