The S50B30 engine

G22 / G23 430i

Enhanced throttle response and broader power band

your engine will produce greater power and torque

BMW M20 B27 - 81 mm stroke

ARP Main Stud Kit, BMW M20 E85 The S50B30 engineThe ARP Main Stud Kit has been expertly designed to work seamlessly and replace BMW Part #11111735525 for the BMW M20 B20, B23, B25, B27 engines, which were utilized in various BMW models such as the E12, E21, E28, E30, E34 3 Series, 5 Series, and 6 Series. Upgrading from factory main bolts to ARP Main Studs is a simple, yet greatly beneficial upgrade. ARP Main Studs offer the following benefits: Uniform Clamping Force: ARP Main Studs provide a