This complete High-Flow Catalyst Installation Hardware/Gasket Kit for the B9/B9.5 Audi S4/S5/SQ5 equipped with the turbocharged EA839 3.0T includes everything you need to install or replace your 034Mototorsport High-Flow Catalyst or OEM Catalyst. This kit includes new gaskets and self-locking nuts, which are all single-use items, plus a new v-band clamp, which can fail to stay tight after repeated removals and installations.