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We weren’t expecting to see much of an increase in output from a simple axle-back installation (after all, bypassing the mufflers altogether only yields 6 hp on the ’08-up NPP system), so the improvements of 1.53 hp and 1.42 lb-ft were a pleasant surprise. More important, the insipid blat of the stock system has been replaced with a deep, baritone rumble that gradually transitions to a menacing ursine growl under power. Nice. View Related Article
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