El Diablo 4" Mufflers for FL - Chrome/BlackThese 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 head pipe it requires