roughridin89 Posted November 15, 2008 Share Posted November 15, 2008 ok so i have hearded a few things about back pressure. one that the z engines like it and the other that the less back pressure the better. i put an after market exhaust, 3inch, on my z with an exchangable catalatic converter so i can use it or just put a pipe that goes to the exhaust. i have been running it with just the pipe but am wondering if puting the cat on would give better performance. any suggestions would be appericiated. Quote Link to comment Share on other sites More sharing options...
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