I dont know how much room you have to work with. What I would do is get a thin ALUM canister,
like what hair mouse comes in, and mount it behind the engine. Run both pipes into it and make an outlet in the
center with thin brass tubing from K&S. If your tight on space, a 6" extension on each pipe made from
silicon or thin flexible natural gas line will make a diff. Have you tried any diff size props? A lot of the noise is from the prop. later daveo