Post by
MinisterofDOOM »
https://forums.nicoclub.com/ministerofdoom-u16506.html
Tue Nov 13, 2007 10:02 pm
It depends on exactly what you're going for, what you're willing to do and/or laws in your area.
A test pipe eliminates the catalytic converter in favor of regular straight piping. Most likely not legal or emissions compliant. If you don't have those issues, that's an option. Otherwise, you could look into a high-flow cat.
A resonator will help eliminate the popping and farting noises that are so notorious among import exhausts.
There are actually quite a few threads discussing people's experiences with various 4th gen exhaust options. Search around and you should find a lot of info.
And yes, gains from a catback ALONE are going to be negligible. There's a lot of other more restrictive/more effective stuff going on aside from the catback. Exhaust and intake mods complement each other, but you'll get the best results if you start with the worst offenders (y-pipe alone will be more helpful than catback alone, for instance).
If your exhast shop won't do the y-pipe, consider doing it yourself (and finding a new exhaust shop...), it's pretty straightforward: one piece, 3 flanges.