I like the sound of the stock exhaust, and if looks doesn't matter, which one would be a better choice for an 05 coupe? Would the exhaust net me more HP than an aftermarket Y-pipe, like stillen's or fujitsu?

Price, of course, is always a factor. If the exhaust nets me 7-10 rwhp, and the y-pipe nets me 5-8, i'd rather go with the y-pipe and save $500.

I just want your opinions.

Thanks

 

Well if the claims from the y-pipe companies are true and you like and are satified with the sound/look of the stock exhaust then I think a y-pipe is a no brainer. The JIC Magic and Tanabe Y-pipes are particularly nice in my opinion.

Tanabe Y-pipe

JIC Y-pipe