The E39 M5 is a great car, but it is not a race car... to heavy. Get an E30 318is and drop a s50 or s52 in it. My E30 is almost as quick as my M5 and will crush it in the corners.
If you want a beautiful sedan with ample power, get the M5... love mine and would never part with it.
Advice... find a good mechanic and budget $1500 per year for maintenance.
Be careful, it's a powerful car that can get a little tail happy at times.
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