ARP Volkswagon Audi Head Stud Kit - 12 Point H760C31XXL Canister-type filter has 3/8"NPT inlet

Canister-type filter has 3/8"NPT inlet and outlet

That's why the fastener experts at ARP have developed special bolts that are far superior to OEM hardware

nyloc nuts

HANS / HNR M6 Threaded Inserts In Shell

ARP Volkswagon Audi Head Stud Kit - 12 Point H760C31XXL Canister-type filter has 3/8"NPT inletARPs product line contains thousands of part numbers, and has expanded to include virtually every fastener found in an engine and driveline. These range from quality high performance OEM replacement parts to exotic specialty hardware for Formula 1, IndyCar, IMSA, NASCAR and NHRA drag racing and marine applications. Since 1968, ARP is the fastener of champions and the world leader in fastener technology. Product Description: Cylinder Head Stud Kit 12