Most designs of the time therefore included secondary air injection, which injected air into the exhaust stream. This increased the available oxygen, allowing the catalyst to function as intended. Cat-back exhaust systems replace every component behind the catalytic converter, including most piping, mufflers, resonators, and tailpipes.

Invidia offers products known for their outstanding quality, and each finished piece is a work of art that sets them apart from the competition. For anyone looking to take their vehicle to the next level, Invidia is a name to remember. So, a cat back is used to indicate an upgrade to the stock exhaust system. And anyone looking to improve their ride should strongly consider a cat back exhaust system. This pipe will connect your mk1 downpipe that we sell for&nbsp