The S.E.P Auto 2.25" oversized Rs4 inlets are constructed using Vibrant Performance aluminum tubing. These inlets will out flow OEM RS4 inlets and other alternatives. They carry a lifetime warranty and each set of inlets is sold complete with couplers and clamps. Like Tial inlets, S.E.P Auto deleted the ports that lead vac hose to feed the n80 valve at the rail, kits include instructions on how to reroute your vac system to work without them.