This article is from the Toyota Tundra FAQ, by Steve Yee with numerous contributions by others.
Both Toyota and many aftermarket manufacturers (Borla, Jardine, and Gibson)
produce what is commonly called "cat back" exhaust systems. Cat Back exhaust
systems are exhaust systems that replace every component from the Catalytic
Converter to the muffler.
The Toyota Racing Development system replaces the stock system with a dual
exhaust system. Borla, Jardine, and Gibson provide bolt on units that utilize
the same exhaust routing that the stock system uses.
The TRD system can be found at www.trdusa.com. The Borla, Jardine, and Gibson
systems can be found on Rod Millen Motorsports' site at www.rodmillen.com.
In regards to header upgrades, the only known bolt on header system is one made
by JBA. More details are coming out about this new header system.
 
Continue to: