Boost Reference Adapter - Suits VAG 2.0 TSFI Engines - Replacement Adaptor for Turbosmart VAG Valves Turbosmart's Boost Reference Adapters (BR As) 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 two ports, while still allowing full, uninterrupted pressure to the MAP sensor. The two ports allow users to run a wide variety of accessories such as boost gauges and blow-off valves, with the responsiveness, versatility and reliability that a traditional vacuum-operated system offers. Precision-machined out of billet aluminium, Turbosmart's BR As ensure an excellent fit, zero leaks and complete compatibility with the OEM MAP sensor.