BMW M50, M52, S50US S52US inline 6, 2 bolt main, ARP Main Studs 201-5000ARP BMW Main Stud Kits, There are many important reasons to use ARP Main Stud Kits, for Audi's including the elimination of main cap walk and fretting,

BMW M10 S14 4-cylinder, 2 bolt main, ARP Main Studs 201-5001ARP BMW Main Stud Kits, There are many important reasons to use ARP Main Stud Kits, for Audi's including the elimination of main cap walk and fretting, as well as protecting the threads in your engine block.

These ARP main studs are made from 8740 chromoly steel and have a 190,000 psi tensile-strength rating. They are precision centerless-ground and thread-rolled to Mil-S-8879 specs, with a black oxide finish for corrosion resistance.

Far superior to any other main bolts available for use in competition engines, ARP main bolts are designed to meet the exacting standards and demands of professional engine builders.