I'm gettin thrown all over the place. lol. I've looked on like 10 different sites and still can't find a straight up answer with proof. For a car running 6 lbs boost, which is better? 3 inch exhaust or 2 1/2 inch exhaust. Anyone have dyno results? Half people tell me 3 and half say 2 1/2. Thanks.

 

3 inch is the best but if you can 2.5 would be ok Closed it now lock

 

I don't have any proof to back up my sugestion, sorry...what size exhaust do you have now?