I have read many threads where people say forced induction is the only reason for a new manifold. I still dont believe that to be true though. You say you have seen many designs that have failed, but how far did they go through with the project. And yes i know that the engagement point of the runners can be changed by a tune, but i was referring to timing and fuel being adjusted to yield the same results or better with a aftermarket manifold compared to stock. I am not trying to come across as a jerk with this post, but Im just trying to see if anyone has ever tried or created an aftermarket manifold.