GFB D Boost V2 VNT Manual Boost Controller (for VNT/VGT Turbos)It? s common knowledge that some engines with vacuum operated ECU controlled VNT VGT turbos suffer erratic boost behaviour, to the point where turbo or engine failures can occur, even on completely stock vehicles. The V2 takes over from the factory ECU control and ensures a stable and repeatable boost curve, which your engine will thank you for! Cleverly packaged within a black anodized CNC machined 6061 aluminium housing are two individual adjustment