ARP Head Studs - 4B11 Evo X
Fits these Applications:
2008-2015 Mitsubishi Lancer Evolution X 4B11
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 (a very common industry practice). It costs a lot more to do it this way, because it's tough on tooling, but the results are well worth the extra effort.
(1) Assembly Lube