with the etched arrow on the dome pointing toward the major thrust side of the piston

- Lowers Intake Air Temps (IATs)

it controls the hydraulic pressure that actuates the camshaft timing adjustment

drawing heat from the oil cooler

This FCST-X does not include fuel pumps

ARP Harmonic Damper Bolt Set, BMW S58 Coupe with the etched arrow onBMW OEM damper bolts are grade 10 and Torque to Yield, designed for one time use. While this is adequate for factory power levels, these bolts fall short when power levels are increased. 5150 AutoSport has observed damper bolts coming loose and breaking, leading to engine and crank damage, as well as improper torque load between bolts. The factory bolts are simply not sufficient for those planning to run above factory power levels. 5150 AutoSport