Is the 480-500whp JB4 tune used in your test's the same as the one used by this M4 that seem to be about equal with a stock 460bhp Stingray!?
http://f80.bimmerpost.com/forums/sho....php?t=1020694
Just wondering cause I was expecting tuned M4s to be much faster then stock Stingrays as the trap speeds suggest, 123-125mph(JB4 M4) vs 118-120mph(stock Stingray)!