Main Stud Kit Mitsubishi 2.0L 4B11 Turbo

The Main Stud Kit Mitsubishi 2.0L 4B11 Turbo is a precision fastener system engineered for high-performance turbo builds and engine modifications on modern Mitsubishi platforms. This kit addresses the critical weak point in factory main cap fasteners: under boost and sustained high RPM, OEM bolts can stretch and lose clamping force, risking catastrophic bearing failure. Built for serious enthusiasts and tuners running elevated boost levels, this stud kit restores factory reliability while supporting aggressive power targets that exceed factory specifications.

ARP studs replace the factory bolts with hardened alloy fasteners featuring superior tensile strength and fatigue resistance, maintaining consistent clamping load across thermal cycling and boost cycles. The stud design eliminates stretching that occurs with traditional bolts, which cannot withstand the pressure spikes of turbo combustion events. Each stud is precision-manufactured to tight tolerances and includes proper sizing for the Mitsubishi 4B11 block, with hardened washers and nuts calibrated for accurate torque-to-yield assembly. This engineered approach keeps the crankshaft mounted securely to the block during full-throttle operation, protecting bearings and preventing block separation at the main cap interface—a common failure point on modified 4B11 engines.

Ideal for owners of turbocharged Mitsubishi Evo X and related 4B11 platforms planning sustained dyno work, competitive driving, or daily-driven boost applications above stock levels, this kit is essential insurance for any build targeting 300+ wheel horsepower. Installation requires engine disassembly and bottom-end access; professional machine shop or experienced DIY builders should handle fitment to ensure proper torque sequencing. Compatible exclusively with the 2.0L 4B11 Turbo engine block, the kit weighs 2.34 lbs and ships complete with all fasteners needed for one engine rebuild.