Comp Cams 132-303-13 Stage 3 LST 206/220 Solid Roller Cam for GM 6.6L Duramax DieselStage 3, all out performance, max effort grind. Requires valve spring upgrade, larger turbo, aftermarket pistons and higher RPM. The LST Camshaft Series uses the newest and most advanced lobe designs from COMP Cams. These new lobes provide the potential for major increases in power and torque in Duramax engines when combined with the appropriate tuning. The Low Shock Technology features lobe profiles designed to maximize additional engine airflow,