ARP Custom Age Head Stud Kit Subaru WRX 2002-2014 / STI 2004-2021 DOHC Vehicle Model_Baja ACT's SB9-XTG6 kit features a

ACT's SB9-XTG6 kit features a sprung

Part #: KSB751

This product is designed and built with the intent of increasing the boost output of any forced induction system

Part #: 140285

Featuring patented DirectDigital™ wideband technology and dual Bosch LSU 4

ARP Custom Age Head Stud Kit Subaru WRX 2002-2014 / STI 2004-2021 DOHC Vehicle Model_Baja ACT's SB9-XTG6 kit features aPart #: 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