Kuryakyn 504 Crusher Mellow Muffler with Slip Stream Tips All the power without all the noise Same great performance and looks as our original Crusher Mufflers but without the renowned bark at high throttle openings Retains a deep mellow tone at cruise and even during spirited riding For an even mellower sound with crushing performance, combine with the Crusher Duals with Power Cells (P/N 517 or 488)Sold in pairs Kuryakyn makes no warranty regarding discoloration of chrome exhaust products.