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I just bought a brand new 2004 Wrangler 2.4L cylinder w/ 5 speed manual transmission. I bought the smaller engine for economy (it is mainly a work car) but could use a little more power. A Jet Performance Chip is available for this engine but I am afraid of voiding my warranty. Can you...

I just bought a new 2004 Wrangler 4 cylinder with 5 speed manual transmission. I had new wheels, tires, 2" lift, front/rear tubular bumpers, and nerf bars installed by 4 Wheel Parts (they did an excellant job BTY)! When I put my Jeep into 5th (overdrive) at speeds > 50 MPH, I hear a...