Turbosmart Kompact shortie dual port - VR03 For 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 amount of compressor surge. Compressor surge, combined with the A45's high boost pressures, equals a recipe for disaster for the