Hmmm, I suppose my 5% is obvious since I already own an RS46 M3 with all (and more) of the niceties you mention. However, the reason I did this is simply because I love the M3 looks and feel and wanted to get it as close as possible to say GT3 territory. However, if performance is what you seek, the the ZR1 will undoubtedly outperform the M3.
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