I recently installed a XZT in my truck, and didn't notice a big difference in performance right off the bat, being how this my first diesel I didn't know what to expect. Finally got a chance to go to the Lake last weekend, hooked on to my 25' Party Barge (it is a wind catchin SOB) and could not pull it for squat, could not pull small hills over 55mph. Pulled my chip out and could pull it fine, got up to 75 on the intersate no prob. Called and talked to the guys at QZ, and sent the XZt back Monday. Got off work yesterday and there was a new module on my front porch just beggin to be installed, so I put that rig in and .......Oh yeah this one is right. My PSD will blow some Black Smoke now
. Just wanted to give a Kudos to Quadzilla for their service.