You tell me, is the Stage II Dinan M3 faster than the Dinan 540? I think so and the Chipped S4 I own spanks my M3 handidly, same driver me. so even if I suck at driving the results should be comparable, but I've been driving the M for years and the S for a couple of days even so there is no competition. I don;t mean to flame anyone but the flamboyant obnoxious, uneducated post seemed to justify it. M's are for the track,S are high tech rockets as someone else put it when I was deciding what to buy.