Product Description 
*The step 1 cam be used to work with stock valve spring rate, no modifications required for a true bolt on item.
**HKS Step 2 Camshafts Require HKS Valve Springs (2201-RN011)
***HKS Step 3 Camshafts Require HKS Valve Springs (2201-RN011) and HKS Lash Killer Kit (2499-RN001)