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ARP uses a premium grade 8740 alloy that is rated far superior to "aircraft" quality. Because ARP studs are manufactured to strict tolerances, you will note that gaskets and cylinder heads literally glide into position and are perfectly aligned-something that won't happen with inferior quality head studs.
ARP studs are thread rolled after heat-treat, which gives them about 1000% (that's ten times) better fatigue strength than those studs that are threaded prior to heat-treat. You will also note that ARP offers specially undercut studs for several engines. This procedure (done only to the shorter studs) more equalizes the "stretch" of both studs, which makes for a more consistent clamping force-one that compensates for head gasket compression when the head is installed. This helps prevent blown head gaskets, and assures optimum sealing!
FITMENT: Mini Cooper S R53 2002-2006
Part Number: 201-4301
ARP Head Studs 11mm WRX 2002-2014 / STI 2004-2019 Subaru Turbo Models (260-4701)
ARP Ultra Torque Assembly Lube 10oz - Universal (100-9910)
ARP Wheel Stud Kit 1.75in WRX/STI 02-20 / BRZ / FR-S 13+ (100-7727)
ARP Custom Age Head Stud Kit Subaru WRX 2002-2014 / STI 2004-2019 DOHC (260-4704)
ARP Head Stud Kit Washer Ford/Subaru (APW995N)
ARP 12 Point Head Stud Kit Mitsubishi EVO 8 / EVO 9 2003-2006 (207-4203)
ARP Turbo Head Stud Kit Hyundai Genesis 2.0T 2010-2013 (228-4301)
ARP Subaru WRX/STi Wheel Studs Kit (3"/5 Studs/One Wheel) - 2002+WRX/STI 2013+BRZ/FR-S/86
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