Well i decided not to go with a F15. BMW offered me a sweet deal on an E70 Msport 5.0 loaded with the M performance package. The exhaust note is awesome.

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2013 X5 5.0 - M Sport, M Performance, Black Saphire, Black Nevada.
Previous -2011 5.0 Msport Titanium Silver, 2008 X5 4.8 BS, sport, 214's, black Nappa.