Although AMG rates M156 from 475HP in CLK63 to 518HP in S63, in reality this engine is right around 505HP, as all cars make close to 420 HP at the wheels - (420/0.83 = 506HP).
VR530, as the name implies, brings Mercedes Benz 63 models to 530HP/485TQ.
The kit consists of: Underdrive pullies, HiFlow air filters, Phenolic Heat spacers and Intake temperature relocating harness.
