Mercedes Benz E55 AMG - W211 PULLEY KIT by VRP Tuning - Our crank pulley is a custom made 2piece design and is SFI Certified. Unlike some of the competitive pulley kits, we did not start with an OEM dampner and simply weld on a new outer ring. It's unique 2 piece design allows the outer rings to be changed without the requirement of having to remove the entire pulley from the crankshaft. It provides a +3psi boost increase. We include everything needed in the kit: VRP 2piece crank pulley, new crankshaft bolt, new waterpump idler pulley, and a new belt. Dyno testing has shown 465rwhp and 512rwtq in combination with our VR550 tuning package.