You forget the premium in repairs, maintenance and insurance that accompanies a M5. That is why many people choose to go with the 540i, it seems like they are saving some cash.
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--'00 BMW ///M5 .:Jet BLK/BLK:. Individual-1 of 1 - Style 65 Wheels; 9.5" Square Set up;275 Tires;10mm/3mm Spacers; Black Kidneys;Muffler Delete; 3.5" Dual Tips; Beast Power; "Dinan" Ducts; E60 SSK; BC Coils
--'07 BMW M5/6.:Indianapolis Red
/Black:. 1of 2 in Canada
'04 Volvo S60R/6spd.:Nautical Blue/Gobi&Black
'88 BMW 635CSi Blue/Tan Sport
'81 MB 500 SEC Euro Koenig