what stage cold plugs should i use.. a guy was telling me stage 4 ngk's but i thought stage ones would be just fine.. can i get another technitians opinion? your help is greatly appreciated..

setup, d16y7/y8 manifold, walboro 255lph, denso 450cc's, omni 4bar map, stock motorand block, phearable.net ecu tuned on 4lbs.. reccomended spark plug gap at. 0.28