aFe 77-46201 Scorcher Tuner Programmer for Jeep Gas Trucks Wrangler I6 4.0L/V6 3.8L 4 Performance Settings, Crawl, Mileage, Towing, or Power, Allows 4WD-Hi Axle lock, Axle and T-Case Ratio Adjustment 4 Performance Settings, Crawl, Mileage, Towing, or Power, Allows 4WD-Hi Axle lock, Axle and T-Case Ratio Adjustment Adjustable Fan Settings, Speed Limiter Settings Crawl Tune, Tire Size Adjustment Manufactured and Assembled in the USA