ARP 201-4303 Head Studs – BMW E46 M3 S54 / E36 3.2L EVO UK / MZ3-MZ4 S54 12pt ARP2000

• Brand: ARP
• Part Number: ARP-201-4303
• Country of Manufacture: United States

The ARP 201-4303 head stud kit is designed for high-performance BMW S54 and 3.2L EVO engines, including E46 M3, E36 3.2L EVO UK, and MZ3/MZ4 S54 applications. Manufactured in the USA, these studs are crafted from premium-grade 8740 alloy and proprietary ARP2000 material, offering tensile strengths of 190,000 psi and 220,000 psi respectively.

Each stud is precisely heat-treated for optimal strength and durability, ensuring complete heat penetration and consistent metallurgical properties. ARP’s manufacturing process includes vertical placement in specialized racks and centerless grinding, resulting in exacting tolerances and superior surface finish. This guarantees precise alignment of gaskets and cylinder heads, reducing the risk of misalignment common with lower-quality hardware.

Using studs instead of bolts allows for more accurate and consistent torque loading, as the stud stretches only along its vertical axis during installation. The undercut design of shorter studs delivers a clamping rate similar to standard shank studs, providing even clamping force across the cylinder head. Installation is straightforward—studs are installed hand-tight, and torque is applied only to the nut, minimizing distortion and ensuring reliable sealing.

ARP is a recognized leader in fastener technology, supplying high-performance hardware for OEM, racing, and specialty applications worldwide. All manufacturing processes are tightly controlled in-house for maximum quality assurance.