Mufflers Ed 4" B/B Dsrs17El Diablo Slip On MufflersThese have the classic megaphone shape capped with a large machined aluminum tip that has the Cobra logo engraved on top Delivers a deep sonic thump that keeps that powerful V Twin rhythm going for miles and miles Internally, the spun louvered core provides the bark and horsepower increase you expect from Cobra Muffler starts as a 2 3 4" piece of tube, and morphs into 4" at the rear When this muffler is used with the Cobra