These baffles will reduce the sound approximately 2-3 decibels from the standard baffles, and offer a deeper rumble.There are two different sized baffles in the kit to work with the 2-5/8'' (right) and 1-3/4'' (left) slip-on inlets for the Vance & Hines M8 designed Touring slip-onsIncludes mounting hardwareMade in the U.S.A.