This kit includes everything you need to install a TurboXS turbo-back exhaust, including gaskets, bolts, and brackets. Comes free with your TurboXS exhaust. Buy this if you've lost or damaged your hardware. Includes: Donut gasket, two-bolt gaskets for before and after the cat (or offroad pipe) section, the special four-hole gasket for the rear section flange, bolts, bolt sleeves, nuts, washers, O2 bung plug, and downpipe bracket. The is NOT included, but you can buy it separately.