Vibrant 1184 Inner Silincer Vibrant Inner Muffler Silencers Baffle measures 3.90" Outside Diameter Will fit in any single wall exhaust tip with an Inside Diameter of 3.85" to 3.90" This low restriction Inner Silencer is sized to fit on Vibrant Part #1058, #1059, 1061 and 1062 and all TPV TURBO Exhaust Systems