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ARP Head studs are a must if you are running in excess of 45psi of boost on your Duramax Diesel. Good insurance against head gasket failure. It is for good reason that virtually every top professional engine builder relies on ARP Pro Series head studs for their all-out competition powerplants. Simply stated theres not a better stud setup on the market today. ARP uses a premium grade 8740 alloy that is rated far superior to aircraft quality. Then each stud is placed vertically in special racks and precisely heat-treated to 200000 psi. ARP studs are thread rolled after heat-treat which gives them about 1000% thats ten times better fatigue strength than those studs that are threaded prior to heat-treat a very common industry practice. You wont find a better quality stud on the market from any other source.