sorry for the noob question but are test pipes and cats basicly the same thing? whats the difference?

 

Hi-flow cats still try to scrub the exhaust, as mandated by emission standards. They might not do as good of a job as the OEM cats, but they do make an effort.

Test-pipes are simply empty tubes, sometimes resonated for better sound. They sacrifice any attempt at emmision compliance for the sake of no flow restriction.

I've never really seen a comparision between the HP/TQ gains of test-pipes and hi-flow cats, but I imagine they are pretty similar. If it's a matter of 3-5HP advantage to the test-pipes, I'd rather run hi-flow cats.

...But I used to drive a '55 Bel Air street rod with a carb'd, hot 468ci big-block. I used to feel bad for the people being gassed behind me. It was pretty obnoxious. So I have no desire to increase the noxious fumes exiting the G's pipes. Besides, I have to make up a bit for those years of driving the '55 around. I should probably be driving a Prius.

 

I have test pipes on the Z. Top end pull is definitely better. You do have to deal with the smell and I'm lucky enough to not have to pass emissions.

 

Same here I love the Sound

 

If you want to hear the sound check this thread https://g35driver.com/forums/intake-exhaust/98207-injen-ses-test-pipes-done-video-inside-i-hate.html

 

+1

Even on the stock exhaust it sounds awesome. Its raspy on the inside but outside it sounds awesome.

http://www.putfile.com/glanette

If it plays 5 seconds, refresh a few times and it should play the full vid.