First off i well start by saying its a stock bottom end. k20a2 Going to get ar crew header with full 3in, 70m thr. What i need to know is can i use stage three cams with springs and retainers? Or is stage two the highest i should go. How high can i bring the rpms safely. Also what is a better ems to go with, the hondata or the aem? The shop that i go to told me there more into using the aem ems. Im new to the k series motor and said to say i think the shop has not much time dealing with this motor to. Any help would be nice.