I made one for my Ski Brendella. Its 4" .060 thick stainless exhaust tubing thats tig welded. The couplers are just a silicone 4.5 to 4" reducer, with stainless t bolt clamps. All in all about 80 bucks in parts and a couple weekends of work. It was a fun project

At idle fumes are the same if not more. But once in gear the fumes are gone. Main reason I did it was for noise and to hear the pylon speakers

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