In independent testing by Ken Duttweiler at Duttweiler Performance on their engine - Hushpower performed equal to open exhaust - no a competitive muffler but no muffler. I work for Hushpower (just to set the record straight) - Kenny is in Saticoy, CA and did the test without payment - call and ask. These mufflers really work. He is just one of many experiencing the performance and mileage gain we advertise.
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