This is a pair of 6061 Aluminum billet EGR block off plates for the TDI engine. Kit includes two 1/4" thick block off plates and two high temperature carbon fiber-based gaskets and two copper locking nuts. One block off plate will attach to the bottom of the EGR valve and one will attach to either the end of the EGR cooler or the exhaust manifold if you are using a cooler delete kit. This kit will trigger a check engine light unless you have EGR functionality turned off with chip tuning.