Been runnin this Comp box for a couple of years now and it helped the power. It toasted the stock clutch as soon as I clipped the wire on, but I never really felt like it made that dramatic of a difference that everybody keeps talking about. I sent it in to be upgraded to the Drag version and when i got it put back in the truck, HOLY COW WHAT A DIFFERENCE. The original chip wasn't giving me anything of what it was supposed to be. Right off the bat I put it on 5 x 5 went to start in 3rd, just to test the tires ya know, built up the RPM's, popped the clutch and didn't move, even this fancy Con clutch just sat and spun until I let off of it. Anybody in doubt of your box performance, if your in doubt it's bad send it back.