All tunes seem to produce similar performance numbers on paper. To fully understand the differences between them, one would have to compare the tunes side by side with two identical vehicles.... as far as I know, no one has done this. I chose Active Autowerks because of their strong reputation, familiarity with their products and ultimately better pricing. I have not been able to compare the tune to another X5M that has been "tuned", however I have been able to compare "tuned" vs. "Stock" side by side. First impressions of the tune were felt immediately by the seat of my pants. The truck responds quicker and accelerates faster and smoother through all gears. From a dead start, first gear is almost useless because it is so short, but the difference you feel most occurs in 2nd and 3rd gears. After that the race is already over and the stock X5M is fading in your rearview. At 60mph on the expressway... downshift twice and the truck jumps with authority. The nose of the "untuned" X5M quickly finds itself inline with my door. Grab another gear and the gap becomes a car length...
good times!

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