ARP Head Studs 11mm WRX 2002-2014 / STI 2004-2021 Subaru Turbo Models | 260-4701

260 - 4701 is an essential part for your next build. It's an authentic ARP product, so watch out for fakes! These head studs fit Subaru WRX from 2002 - 2014 and Subaru STi from 2004 - 2021. If you're aiming for 500whp or less, these are the perfect head studs. ARP uses a high - grade 8740 alloy, better than 'aircraft' quality. Each stud is heat - treated vertically in special racks to 200,000 psi. They come with 12 - point style nuts and are OE - 11mm sized. The stud head has a 4mm Allen for threading into the block. ARP head studs are made with high precision, allowing gaskets and cylinder heads to fit easily and align perfectly. They're thread - rolled after heat - treat, with 10 times better fatigue strength than those threaded before heat - treat. Each kit includes premium parallel ground washers. These studs are a must for high - performance engines with increased boost and are the best on the market for your WRX or STI.

Using these ARP head studs is straightforward. First, make sure your engine is clean and ready for installation. Use the 4mm Allen on the stud head to thread the studs into the block. Then, attach the 12 - point style nuts. When installing gaskets and cylinder heads, they should slide into place easily. Be aware that these are authentic ARP products, so avoid using fakes. For maintenance, regularly check the tightness of the nuts. If you notice any signs of wear or damage, replace the studs immediately. Keep the studs clean and dry to prevent corrosion. These head studs are designed for high - performance engines, so they're suitable if you're aiming for up to 500whp.