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I don't believe you, my friend has 03 540iA sport with dinan stage 2 aka software, exhaust and intake. One time he was racing with e46 M3 and he said he never felt so slow before! So cmon man I drove e46 M3's and there's no comparison between my 540(it's 6 speed btw). They're just much faster(more hp and less weight).
The car I raced was a convertible 400lbs heavier than the coupe.... the e46 M3 coupe is def. faster!!!....