- A-1 Performance
 - Selling Dynomax performance mufflers and pipes for most cars and light trucks, bolt-on performance exhaust systems, and performance catalytic converters. - All Catalytic Converters
- Sells new OEM direct fit catalytic converters for import cars.
- Andy's Auto Sport Performance Exhaust Systems
- Offers an extensive array of custom exhaust systems for cars and trucks.
- B & B Fabrication, Inc.
- Develops and manufactures stainless steel and carbon fibre performance exhaust systems.
- California Muffler
- Offers mufflers and parts for foreign and domestic vehicles.
- CarParts.com Exhaust Systems
- Online shop offering exhaust and emissions systems for many makes and models.
- Catalytic Converters Site
- Offers OEM catalytic converters for Mercedes, BMW, and other European and Japanese cars.
- Discount Catalytic Converters, Ltd.
- Supplier of full high flow design catalytic converters.
- DMI Catalytic Converters
- Products include catalytic converters, direct fit catalytic converters for both foreign and domestic applications.
- GHL Motorsports
- Provides stainless steel exhausts, headers, and mufflers for Porsches, Corvettes, and other high performance cars.
- JC Whitney: Exhaust Systems
- Find high quality exhaust systems for all makes and models.
- Miller Catalyzer Corporation
- Manufacturer and distributor of new and remanufacturered direct-fit catalytic converters, selling to distributors, wholesalers, and the public.
- PowerTone Performance Automotive Products
- Makers of a negative back pressure muffler exhaust system designed to increase flow.
- Stan's Headers
- Manufacturers and installers of fabricated headers for high performance automotive and marine engines.
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