I don't have any sort of exhaust for my Civic right now except for a 3" downpipe. Its a D16Y8 turbo'ed and I'm looking to put down over 300 at the wheels. I'll be driving it on the street quite a bit, and taking it to the track for a lot of drag racing.

I also heard that New York is passing tougher emissions (or at least enforcing them now). Every car will have to be hooked up, tested and then registered with the state. I read somewhere that larger catalytic convertors (like 3") have trouble heating up sometimes and it causes people to fail. Because of that, I was thinking of going with a 2.5" exhaust from the downpipe back with a 3" electric cutout in the downpipe. What is everyones suggestion? Should I just run a full 3" exhaust or go with the cutout?

 

get a 3 inch. have an exhaust that has a silencer. just my 2 cents

 

Its not the noise that I'm worried about, its passing emissions. I was thinking also with the AEM EMS I could get a map that ran fairly lean just for emissions testing, and just open the wastegate. Anybody else have advice?

 

get the cutout welded to ur downpipe. that way you can have the best of both worlds.