Nissan SR20 turbo and non-turbo engines.

Arp are the leading brand in fastener technology. All fasteners are made with the highest quality materials with quality assurance testing. 

The studs are manufactured from 8740 chrome moly steel, heat-treated at ARP to 190,000 psi tensile strength, and precision J-form threads rolled after heat-treat to create a fastener that has threads 2000% stronger than others.