Cobra Exhaust 4 Slip-On Muffler For Yamaha Bolt The 4 round muffler that tapers out to 4-1/2 at the rear of the body features a satin black finish and is equipped with a matte titanium finish for such a simple yet sleek look. This muffler also comes with a 3 baffle core that uses Cobra's proprietary sound tuning material that allow for a deep bass tone that is unmatched. Features Deep rumbling sounds 4 round muffler front expands to 4-1/2 diameter near the rear Satin Black muffler includes heat shield Matte titanium finish on aluminum tips to match heat shield Tip features seven, 12-point bolts that provide the dished tip a distinctive