Comp Cams 132-300-13 Stage 1 LST 186/200 Solid Roller Cam for GM 6.6L Duramax DieselStage 1, No Springs Required, this is the grind that should have come from the factory for the Duramax. Great response & power potential. Works with factory or performance tune. 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