the ARP Head Stud Kit 201-4307 features a tensile strength of 200

00mm Intake / 11

000 HP / 8

Optimized for Boosted N63 Engine Builds

These cables connect directly to the unused auxiliary ports on the ReFlex+ (Aux Out 1/2/3 and Aux In 4 for PSI)

BMW S55 Lifter Shim Set by Ferrea 1300142 the ARP Head Stud KitFerrea Lifter Shim Set for BMW S55 Engines The Ferrea Racing Lifter Shim Set is specifically designed to optimize the valvetrain stability of BMW S55 engines, delivering smooth, consistent performance at high RPMs and under demanding conditions. These precision engineered shims fit beneath the stock hydraulic lifters to limit lifter travel, preventing valve float and improving throttle response. Whether you're running high boost setups or prepping