The Aurora VFR 4000 features - All New HSM Casting - 63mm, Slim Hub, 11 Blade Billet Compressor Wheel - High Profile Vane Pack for increased flow - New Solenoid - New Compressor Housing - New Turbine Housing - New Bearings and Bearing Housing - 3 year 36k mile warranty The Aurora VFR 4000 for 15-19 Ford 6.7 Powerstroke offers significantly improved materials and internal components compared to the stock turbo, offering increased flow with quicker spool times, increased efficiency and increased engine braking performance.