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 113/4"(left) slip-on inlets for the Vance & Hines M8 designed Touring Slip-ons. Included mounting hardware Made in the U.S.A.