`Sorry, but I can't believe this will make your car faster.

If its doing anything, its changing the throttle response based on pedal position. Same effect as your foot mashed to the floor.

I wouldnt waste my money on it.

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2008 BMW X5 4.8i (E70)
Alpine White, Burl Walnut, Nevada Black, Sport Package, Cold Weather Package,
Premium Package, Technology Package,
Rear Climate Package, iPod adapter