Turbosmart Boost Reference Adapter | Multiple VW/Audi Fitments (TS-0720-1002)VW Golf GTI Mk5 6 Boost Reference Adapter Black by Turbosmart Turbosmart's Boost Reference Adapters (BRAs) allow access to a reliable boost reference, without compromising the operation of the car's standard sensors and control systems. The BRA attaches between the vehicle's MAP sensor and the intake manifold, providing a pressure source to a vacuum port, while still allowing full, uninterrupted pressure to the MAP sensor. The single port can be used