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JET Performance Chips for 2005-2006 Jeep Grand Cherokee WK offers you point by point air or fuel ration, advance ignition and other various tuning points for higher performance boost of up to 25 horsepower. They enhance throttle response, acceleration and low end torque. They are also durable and have very lightweight construction. You can have these Performance Chips in semi-automatic transmission type. Order now! We ship for free without hidden fees.