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Renntech is in your neck of woods. They claim to have the fastest tune only x5/x6m. The ESS tune also seems to be very solid and you can load and unload it prior to going in to the dealership. I'd look into Eissenmann or RPI exhaust. Downpipes add the most power but will create interior resonance and voids warranty. (Tune voids warranty also)
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2014 M5...AMS downpipes, BMS tune, lead foot
2011 X5M....Downpipes, exhaust, dyno tuned
2008 Ducati 848....pearl white, Termignoni exhaust
CLS55 and C6Z06 (previous rides)
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