The AirPro Buddy Plug is an aluminum insert for OE exhaust systems designed to allow owners to tailor sound output (dB) to their particular needs. It's also a far more cost effective option to replace a lost OE baffle, since most OE's require you to buy the complete muffler assembly, sometimes for several hundred dollars. Designed for those who want to quiet their bike down, where noise can be a problem, whether it's sneaking into your hunting turf, riding in areas were the residents don't like loud bikes. It's easy to open it up quickly for a blast on the trails and the same to insert as many bolts as you'd like before you set out for home. It's a wonderfully simple & easy-to-use solution.