Can someone define exhausts for me


New Member
Oct 26, 2009
ok im assuming this would just be a "talk" type thread. I am curious can some define what a cat back exhaust is exactly. Yeah it is an embarrassing I was looking at exhausts and I can see the obvious H-pipe and X-pipes defs. I am assuming that a cat back means the pipes continue straight back without connecting. Is this assumption correct? Just something I was wondering about. Thanks
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SN Certified Technician
Aug 14, 2009
Houston Texas
A "cat back" exhaust system means everything from the cats backwards to the exit at the rear of the car.

Normally, there is a flange just behind the cats. This makes an easy point to split the exhaust system. The after market exhaust replaces everything from the flange backwards. This leaves the factory cats in place. By doing it this way, if avoids the expense of new cats as well as other issues that replacing the cats would entail.