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13. To finish off the install, our technician centered the exhaust tips in the factory cutouts in the bumper before clamping the tailpipes to the muffler. After about a half an hour, our Hemi had a nice throaty growl without the obnoxious drone in the cab. The after dyno numbers revealed a 19hp increase to 331 hp, and a 15 lb-ft improvement to 345 lb-ft of torque.