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AMS developed the Alpha Performance Porsche 991
Compatible with OEM
Invidia N1 Exhaust Systems are also designed for the most aggressive looks
Comprehensive hardware for mounting is included
ARP Cylinder Head Stud Kit Engine Bottom End Internals AMS developed the Alpha PerformanceIt 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, there's not a better stud setup on the market today. For openers, 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 200,000 psi. This procedure ensures complete heat