BOV Kompact PlumBack - Shortie - Mercedes A45 AMGDespite the AMG four's high boost levels, these vehicles do not have a bypass valve fitted from the factory. This is likely because the plastic valves typically found in OEM setups would not be capable of handling the A45's 26PSI of boost without failing prematurely. As a result, the AMG 45 models suffer from a significant compressor surge. Compressor surge, combined with the A45's high boost pressures, equals a recipe for disaster for the bearings