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Look for a number stamped into it, will likely have to scrape paint to see it. Off-hand it looks a LOT like a 48-52, but the differences between those and 53-56 are small.
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.