ARP Custom AGE 625+ 11mm Head Stud - Subaru EJ30, EJ255, EJ257 Cooling Accessories 2005-12 Legacy GT and 2004-13

2005-12 Legacy GT and  2004-13 Forester XT

The Magnum case is then drilled and tapped to accept 14mm head studs that combined with the IAG Fire-Lock head gasket set greatly reduces head gasket failure during high cylinder pressure scenarios

data logging

DYNO TESTING

ARP Custom AGE 625+ 11mm Head Stud - Subaru EJ30, EJ255, EJ257 Cooling Accessories 2005-12 Legacy GT and 2004-13Custom Age 625 Plus is a newly formulated super alloy that demonstrates superior fatigue cycle life, tensile strength and toughness with complete resistance to atmospheric corrosion and oxidation. ARP is the first to develop manufacturing and testing processes for fasteners with Custom Age 625+. Best of all it is less expensive and expected to soon replace MP 35 as the material of choice in the high strength, super alloy field. Typical tensile