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The JET Performance Chips for 2004-2006 Wrangler TJs & Grand Cherokee WK feature point by point air or fuel ration, advance ignition and various tweak points for even better performance gains of up to 25 horsepower. They will surely enhance throttle response, acceleration and low end torque. These modules are durable and have very light built. You can have them in manual and automatic transmission type Jeeps. Order your own Performance Chip or Module today at a very low price and free shipping coming from 4WheelOnline.com.