You won't find a better fit, function, and price combo anywhere - plus, it's made right here in Canada. With CNC machined Aluminum & Stainless Steel Components, this kit has a guaranteed precise fit that'll go the distance. This P1 Race Products key feature is a CNC machined one-piece 6061 T6 Aluminum Pass Through Plate. The Exhaust Manifold Block Off Plate is CNC machined from T304 Stainless Steel which accepts any aftermarket 1/8" NPT EGT Probe.