Your biggest challenge will be getting your hands on one of the two units. I ordered mine but from what I am reading on other sites it can take several weeks before it ships and a few more before you get it. I went with the Hualingan unit and ordered it on the 23rd but I have not received a tracking number yet. But that seems to be the common problem right now.

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2010 X5M /// R63 AMG...Wifey's 540HP Family Hualer

2001 X5 3.0i Sport 335,448 miles & counting...
SMG M3 Steering wheel
E46 Stainless Racing Headers
4.6is Exhaust
Turner Pulleys
Afe Intake
Brembo drilled rotors
PowerFlex Bushings
Hualingan
30mm H&R Spacers rear
20mm H&R Spacers front
Bavarian Autosport High-Performance Coils
Active Autowerke's Performance Software