Pro-Xtreme

16x Exhaust Valves

This fuel rail features three 8AN ORB ports

Four digital inputs

following the recommended torque sequence

ARP Girdle Bolt Set, BMW S58 Kit Options:Girle Bolt Set + Oil Sprocket Bolt Pro-XtremeARP Girdle Bolts for BMW S58 Engines Girdle bolts are used to secure the engine girdle, a component that reinforces the bottom end of an engine via the main bearing caps. The girdle ties the main bearing caps together and often the entire bottom of the block, adding structural rigidity and preventing the block from flexing under high loads. As horsepower and torque increase, it is important to use hardware that will adapt to the increased temperatures