BD Diesel's Velocity Billet Compressor Wheel has improved performance and response over stock and cast wheel designs. The Velocity wheel eliminates compression surging with quicker turbo spooling and higher boost pressures that reduces EGTs, improves fuel economy and reduces visible emissions. Additional efficiencies can be achieved with BDs Adjustable heavy sprung Waste Gate Control to increase boost pressures and prevent leakage or creep from the stock spring compressing. Also available, Ultra Kit with Velocity wheel, Waste Gate Control and 1.00 A/R turbine housing for increased top end horse power by eliminating engine choking from excess exhaust drive pressures.