E46 M3 S54 ARP Main Stud Kit - ARP-200-4102

For E46 M3s running S54 engines - especially those chasing stage 2, track day or fast road reliability - the ARP-200-4102 main stud kit replaces factory stretch bolts with precision 8740 chromoly studs, heat treated to 200,000 psi.

• Direct-fit for S54 only - no compatibility with N52, N54 or N55; not for E90/E92 M3 (S65)
• J-form threads rolled after heat treatment - critical for fatigue resistance at 8,500+ rpm
• Includes parallel-ground washers and ARP 12-point nuts - full conversion, zero extras needed
• Reduces main cap walk and crank flex under load - proven on high-boost S54 builds and race-spec bottom ends
• Search terms this actually matches: E46 M3 S54 main studs, S54 stage 2 fasteners, ARP 200-4102 UK, track day S54 bottom end, fast road E46 M3 main studs