Quote Originally Posted by DarKStaR View Post
Header wise i would stay away from the bisi. I would just get the stock intake manifold ported and remove the iab's. If you havnt got it tuned yet i would deffinatly do that after swapping the header and intake. That should get you around where you want. Make sure your intake piping is atleast 3" and let the exhaust breathe.
Ok. I've got a Feels intake extension with the stock 3" prelude tube. I didn't do the exhaust but I wanna say its 2.5" and I might open that up to 3" all the way back.

Know anyone that ports stock manifolds?