Inliners International Forums General Discussion Engines Looking for exhaust recommendation for dual to single

XXL, follow Larrys (twisted6) advise, use what ever the "Y" pipes outlet size is back to the muffler, the drop down 1/4" in diameter for the tail pipe. With a fairly stock engine and no real hard driving, you are not going to see much gain or loss in pipe size. Keep 2" as your minimum size and don't go over 3", and you should be fine. The intake and exhaust ports are the restictions, not the manifold or pipe size.

Joe