first and foremost, is the exhaust manifold on a jdm d15b identical to a z6 or a y8? i am researching my options on picking up an exhaust manifold and i have heard that enlarging the collector on a z6/y8 manifold will net some gains? is there any truth to this? thanks.


Modified by Mr.LadyBug at 12:05 AM 2/9/2005

 

ttt

 

bump

 

stock collector is a dinky 1.5 maybe 2inch at most, and yes it would make a difference as the bottle neck is right at the collector.