This is a Universal Bolt-On Adapter for the Kolpin Stealth Exhaust system. With this adapter you will be able to use the Stealth Exhaust system and quiet your ATV/UTV by 5-7 decibels with no loss in performance. Fits: Honda TRX 250, 300, 350, 400, 450 and Universal for other flat or concave OEM Muffler Outlets Package IncludesGasketSelf-tapping screws3-1/4" diameter flange with 1-1/4" (outside diameter) tailpipe