Vance & Hines 3in Round Twin Slash Slip-On Mufflers - Black , Color: Black 46839 NOT LEGAL FOR SALE OR USE IN CALIFORNIA Feature muffler bodies shielded by full-coverage heat shields for a blue-proof look Increased performance with a throaty growl Include standard louvered core baffles Optional baffles available in competition or quiet which reduce sound levels 3-5 dB