Im getting RB street port and To4B turbo next winter and I was thinking how big exhaust would be optimal? Ive heard that RB 3" exhaust should be the best exhaust ever built to TII. 59hp to stock car..!?! But stock car has only 200 hp and Im hoping to get at least 350rwhp after my mods. So my guestion is should I go RB 3" or bigger to get best power and turbo response??

Does Anyone have experience of bigger than 3" exhaust?

 

3' is just about as big as you need to go for anything under about 400-450hp

 

on a style note, id recomend keeping the dual exhaust for whater size you pick. it will flow more than a single of the same diameter and besides, a single exhaust just looks funny under the FC's dual outlet bumper.