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The wait may finally be over. At SEMA next week, Jeep will be showing a concept Wrangler Unlimited dubbed 50 JK. The Mopar Skunkwerks team beefed up this hardtop four-door Wrangler concept with a four-inch lift, 35-inch tires, and Dana 44 axles. The real beef comes from a new Cummings 4.2-liter ...