Mercedes-Benz 63 AMG upgrade turbochargers kit Bolt-on solution for Mercedes-Benz 5.5l AMG M157 engine power gain, designed to work with stock exhaust manifold and other engine units. Comes in two options - Stage 1 and stage 2, specifications and compatibility list written below. Turbosystems upgrade turbochargers for Mercedes-Benz 5.5l AMG M157 features: dual ceramic ball bearings; reinforced bigger 6+6 blades machined from the solid compressor wheels: Stage 1 - 51/64mm; Stage 2 - 54/67mm; bigger turbine wheels: Stage 1 - 54/49mm; Stage 2 - 58/54mm; Refurbished housings; New shafts; Balanced on VSR; Power range: up to 900+ hp When installing new turbocharger we recommend to read our Installation guide.