Best mods I did were the KW V3 coilovers and the ECU flash. IMO, the coilovers correct the only serious performance/design deficiency of the car.
For now -- 2009 X6 5.0i
Recent - 2009 Porsche 911 Targa 4S
Prior --- 2008 E92 335xi|6MT|Dinan ECU|Dinan Free Flow|KW V3 Coilovers|Monoco Blue Metallic|Goldenrod--- Nav/USB/PDC/Sport/Premium/Cold Wthr|Yokohama ADVAN Sport|Raptor plates ---> SOLD