the only thing in the exhaust system that would cause a code would be the o2 sensors . as far as passing inspection , even if your in a state that has the sniff test i highly doubt a bigger cat would make you fail . now a bad or clogged cat would defenatly make you fail emmisions testing. Can I eli...

skippy wrote:yes you can , most guys here went with the high flow cat . magnaflow makes them as well as many other companies.

This won't send a code ? I was told by a muffler shop that it wouldn't pass emissions.

hi guys, I think i have a cat going bad on my 2001 astro. I have a bad smell after getting on it heavy. Do i need to replace it with oem or can I go with a aftermarket high flow unit? I called my local shop and was given a quote of 200.00 each ( it has a small in front of a large).I can buy the whol...