Powerstroke 7.3L GTP38 Turbo Bigger 66/88mm Cast Compressor Wheel Upgrade Rebuild Kit DIY Upgrade 66/88mm Cast Compressor Wheel provides much more Airflow than stock 60/80mm wheel and solves the commen Surge Problem Upgrade from Stock 270 to 360 Thrust Bearing System for better Lubrication. Stepped Gap Piston Ring to eliminate the Problem of oil leaking. Bigger Compressor Housing with 4" Intake Hose, Easy Installation Perfect Upgrade Kit for 99.5-03 Powerstroke 7.3 Turbo