Catalytic Converter

Just wondering anyone knows a good catalytic converter for a 95 civic ex. Also correct me if I am wrong, is the OEM spec for the cat a 2.5" diameter?

a good cat is stock unless you have a lot of power adders that require a larger bore exhaust.


stock cat should be less than 2" diameter on a Civic

Sorry about the confusion, what I ment was a high flow cat, or a straight pipe. It does not necessary to passing smog test, I just want to compare which cat (passing and not passing smog test) outthere is worth to get.

PS I once saw a Y shape piping (install before cat) that allow user to bypass or not bypass the catalytic converter, does anyone has a link to that?

A highflow cat might help if you already have intake, headers, and exhaust, i would get those three first, then a Carsound hi flow cat. Just don't gut yours, the big open space will cause a disturbence and your will lose velocity, so get the high flow cat, or a test pipe if you don't daily drive your car much.

I just need to know which high flow cat or test pipe are good out there. Brand? Price? diameter? Thanks

Carsound cat. Look it up on google.

will high flow cats pass smog in cali?

yes it will pass. i have a PACESETTER in mine cost was $233.72
you can look around for a decent price hiflows go from $80-$300:2cents:

at a shop close to my house (just outside of ottawa, Canada) they have some for $75 CAD.