to a return style system

Upgrade your BMW S54 engine with the Supertech valvetrain kit for improved performance

1 x BMW Coolant Pipe O-Ring  - 11537545302

Lifters sold separately

ARP Head Stud Kit, BMW N63 F80 to a return style systemUpgrade the performance of your BMW N63 engine with our ARP Head Stud Kits, specifically designed for the turbocharged V 8 N63 engine. As you increase the power output of your engine beyond its factory specifications, the head and block may start to separate, causing factory bolts to stretch and fail. Our ARP Head Studs are designed to be stronger than factory bolts, ensuring your race engine stays together even under extreme conditions. Our Custom