Great performance gains and Comp cams go hand in hand, stage 1 cams can use factory springs, stage 2 and 3 require High lift springs. Stage 1 Cams great for Forced Induction(supercharged, Turbo Charged) cars with Bolt ons, stage 2 and 3 great for engines with head work, stroker engines, increased boost, turbo Chargers etc. etc. Call for your application. Custom cams also available.