Right now I have a Rochester B on the stock intake. I just got off the phone with my dad, who does all of the fabrication work (I haven't learned to weld yet, but I do the mill work) and he agreed that there is no gain in running a split exhaust into a single pipe. He asked if I could design a tubular exhaust manifold that ran into a single collector and use a 2 1/2" pipe instead of the stock 2" pipe size. Have any of you tried building your own exhaust manifolds? And any of you that have, can I have some pictures so I know what I'm working towards?