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- Modded
--'07 BMW M5/6.:Indianapolis Red
'91 BMW 850i J Spec Modded
'88 BMW 635CSi Lowered
'81 MB 500 SEC Koenig WILD RIDE