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JET Performance Chips for 1993 Jeep Cherokee XJ & Grand Cherokee ZJ with 5.2L Engines (Manual or Automatic Transmission) offer you great durability and incredible toughness. They boast of their Dynamic Spectrum Tuning that provides power gains across the whole power band, not just at full throttle. They have point by point air or fuel ratio, advance ignition and extra other tuning points for greater performance gains of up to 25 horsepower. These Performance Modules are very simple and easy to install. They are also backed with a 2 Year Warranty.