IAG Performance ARP 1/2" Head Stud Set Circo EOFY These are one of the

These are one of the best cats on the market for the CN9A/CP9A Evo 4-6 models using the Invidia Front-Pipe

A combination of proven Process West engineering and leading edge fresh-thinking design ensures that Verti-Cooler is the very best option for your onwards Subaru WRX

resulting in exceptional wheel balance

Racer Hub with Quick Lock capability

IAG Performance ARP 1/2" Head Stud Set Circo EOFY These are one of theThe IAG Performance 1 2 Inch Head Stud Set is manufactured by ARP and is designed for use on high horsepower Subaru EJ25 and FA20 DIT engines. Due to the larger size of the head studs, a greater load can be placed on the fasteners and in turn it aids in preventing cylinder heads from lifting in race applications. The larger size of the head studs requires the case halves to be drilled and tapped. The cylinder heads will also require drilling to accept