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Doug, are you referring the M performance package with 15 hp and 30 ft-lb torque? I test drove the standard 2013 X5 35i and one with M performance package, right after. The difference was subtle at best, not worth the $1600. If you know of a different BMW tune with more power, please let me know. I would be very interested. I'm considering the Dinan stage 2 tune, but very concerned, even with the Dinan warranty. I can see BMW and Dinan trying to blame each other when a drive train component fails, even under warranty. And what happens if you get BMW extended warranty and something goes wrong with the drive train. Would BMW cover a Dinan tuned X5?
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