This precision process produces a head stud rated to 220,000 psi of clamping force, far outperforming any factory head bolt. The incredible strength of ARP head studs protects against accidental fretting between the cylinder head and engine block that could lead to potential engine failure or other damage. Each complete set comes with notched and hardened washers to ensure even clamping force and precise torque reading during assembly. It's important to use the same head gasket thickness that came off your engine. These head gaskets are manufactured to precise OEM specifications using multi-layered steel construction, beaded seals around the combustion chambers, and micro polymer seals around the oil and water passages to prevent leaks due to imperfections in the sealing surfaces. Each kit also includes a complete set of the required gaskets and o-ring seals for all components that attach to your cylinder head including the exhaust manifold, up pipe, upper and lower valve cover, along with valve cover grommets, valve seals, and turbo drain seals (when applicable). , EGR Delete, Remove your factory EGR with Sinister Diesel's own Exhaust Gas Recirculation (EGR) Delete Kit. This kit completely replaces your old factory EGR giving you quicker turbo spool and lower exhaust gas temperatures (EGTs). This design has been fully pressure tested to ensure you're better protected against leaks! If you want a more durable EGR delete, this model is designed for you. The EGR delete kit has been made out of 304 stainless steel and billet aluminum. This kit has been designed to recirculate coolant faster, giving you lower coolant temperatures than ever before. Using this EGR Delete kit also eliminates exhaust recirculating through your intake manifold for increased reliability.