ARP Custom Age Head Stud Kit Subaru WRX 2002-2014 / STI 2004-2021 DOHC vendor_Manley Performance Ksport’s advanced upper pillow ball

Ksport’s advanced upper pillow ball mount is available on some applications

All Hawk Performance compounds are not compatible with carbon ceramic rotors

The Fidanza 06-07 WRX flywheel is SFI Certified

This clutch kit is best suited for race car use only

ARP Custom Age Head Stud Kit Subaru WRX 2002-2014 / STI 2004-2021 DOHC vendor_Manley Performance Ksport’s advanced upper pillow ballPart #: 260 4704 If you are planning on making 500 675whp, these are the head studs for you! ARP head studs for your Subaru WRX and STI ARP uses a premium grade 8740 chrome moly that is rated far superior to "aircraft" quality. Then, each stud is placed vertically in special racks and precisely heat treated to 270,000 psi. These studs use a 12 point style nut and are OE 11mm sized. The head of the stud uses a 4mm Allen to thread the studs into the