Cobra, El Diablo 4" slip-on mufflersSatin black with a black tip. Slip ons inspired by the El Diablo 2 1. Internally; the spun louvered core provides the bark and horsepower increase you expect from Cobra. It starts as a 2 and 3 4 inch piece of tube; and morphs into 4 inches at the rear. To finish it all off; Cobra machined a beveled tip to complement the lines of the megaphone; and etched the Cobra logo on top.