I was wondering if the 2.5" y-pipe from Cattman is any different then from the 3" one when used in a N/A car. I'm thinking of getting the 3" y-pipe right now because I will be getting NOS in the future, but at the time being is there any performance difference if I put in the 3" right now then with the 2.5"? Or are they just about the same? If anyone knows, please help me out, thanks.

 

in my opinion, i think you should get the 2.5 inch pipe even if you do get nitrous later. the 3' pipe is way too big. even some SCed guys said that the 2.5" pipe performed better than there 3" pipe. with a 3" pipe on a NA car, you will have very little back pressure and your low end will suck. i say, get a 2.5" pipe.

 

hmm...i guess I'll get the 2.5" then, I did kind of think that 3" was a little too big. Thanks for the feedback.

 

The back preassure thing is very true. I have a 3" tube going from my cat to my muffler and I have lost some low end, good part is that I gained top end power. I have a SC in the mail and will be selling my Stillen Y-pipe in about a month. It is $330 new(without shipping). Make me an offer and I'll see if I can take it off sooner. I have had it on my car for 11 days counting today(friday). Definatley go with the 2.5" one.

Kirk