OK, I'm sure you're right, upside-down mani's would undoubtedly interfere with stock intake tube and upper i/c tube. I just figured that as custom as this install is that re-routed intake and custom i/c tubes would be needed anyway. I was thinking possibly roof mount i/c with a fan, but not sure how it would all fit together with the rad and exhaust. BTW, is this going to be mid engine or is the engine hanging off the back?
Randy, I like your Supertrapp idea. Very tunable, probably loud, but nice and small. Whatever you use, personally I think one muffler is better than two as long as it's big enough to flow. John