We use only the best in head studs manufactures. These ARP head studs are an exact fit for the 2017-Present x3's on the market. Changes have been made from ARP to allow these head studs to fit correctly allowing for the highest clamping force across the board. These ARP 2000's allow the customer to increase torquing to 55 ft lbs. These head studs are a must for any turbocharged application!