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From what I have read so far from manufactor's sites is this. Once you tune your vehicle with a new tuner you cannot re-program another vehicle until you re-install your original program. Is this true with all tuners? Is there a chip out there that will change shift points only? I'm happy with performance but would like to see lower RPMs for my 95% city driving.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.