its probably worked out in the classes the m3 entered, group a only had sierras pretty much so nothing else to beat, was a supra and a starion and a bi turbo one season but they soon changed to sierras whereas the m3 all over the globe had competition from different manurfacturers, there was more competition in etcc and wtcc so as the m3 won its class pretty much every outing thats prob where the figures come from