ARP Main Stud Kit 2-Bolt For 91-00 BMW 325i/525i/M3/Z3 & M50/M52/S50US/S52US 3000 - 4000 lumens The XDP Performance Valve Spring

The XDP Performance Valve Spring feature a conical design for better valve control than a standard straight spring

44% increase in filter area (stock: 56

making its debut in the 2013 model year of the Ram 3500 HD

The ARMOR BLK series offers the same performance as the other series with an engineered

If you have fitment concerns

ARP Main Stud Kit 2-Bolt For 91-00 BMW 325i/525i/M3/Z3 & M50/M52/S50US/S52US 3000 - 4000 lumens The XDP Performance Valve SpringDesigned for BMWs robust M50 based 24 valve inline 6 engines, the ARP 2 Bolt Main Stud Kit offers bulletproof bottom end reinforcement. It eliminates main cap walk and fretting while preserving block threads under high load conditions, ideal for high performance street builds and full race applications alike. Made from premium 8740 chrome moly steel, each stud is heat treated to 190,000 psi and rolled with J form threads after treatmentensuring