I ordered a chip off of eBay about three months ago from GTX Performance. Installed the chip in jiffy...and POW!!! With the chip coupled with my Stillen Intake, the Alt was finally livin' up to it's name, BLZNALT! Now, the company claims a 20hP gain, and I would be obliged to say that it's up there. However, the claim that there is no loss in gas mileage is BS. I have been keeping track of my fill-ups the last three months and it seems that I probably lost about a hundred miles to the tank. Better performance at the sacrifice of gas mileage is alright with me (it's worth the noticeable power increase). But does anyone know of any possible future problems that I could face if I leave the chip in? I can't seem to find anyone who can give me the true low-down on this "cheap thrill" chip.