LA Choppers Tru-Power Slip-Ons - 4in - Black with Chrome Tips , Color: Black LA-1194-02 Dynoperfected stepped internal pipes optimize torque and performance Vortex generating baffles provide awesome sound and excellent acceleration Beautifully hand polished and triple-chrome plated no bluing finish Available in 3-1/2in O.D. or 4in O.D. tubing for the Baggers to give you the tight, tough look you desire Designed to work with factory or aftermarket header pipes