Is it preferable to get the 3" bore on an exhaust ? what are the 2.5" bores like, is there much difference in power ?

KR

Dave

 

2.5 is fine for most but will start to restrict power at 350 bhp ish before that there will be negligible difference i think.

 

yep no difference unless your running big bhp ! im selling my tsl group n exhaust system 2.5inch bore as i have fitted a 3inch bore system thinking i would get a bit more power but no difference at all ! depends what comes along when your after one 2.5 or 3inch but didnt make any difference to me

 

I'm hoping to get over 400bhp on my 2.5" system. I'll let you know how I get on.

Dave

 

will that not be really restrictive im running a 3 inch on my 400bhp STI7