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Flowmaster again sponsored our Ultimate Adventure trip. We had the company send us its '06 Cummins Dodge after-cat exhaust kit with a 50-Series heavy-duty muffler and 4-inch tubes. We also checked out Flowmaster's new HushPower muffler for the Cummins and would have used it except the 50 Series tucked up slightly more within the frame. This exhaust gave the Cummins a great sound, but wasn't too loud on the trail or street.