I've seen these on ebay for over a year now and am still wondering about them. I'm not stupid enough to believe their claims of 130hp and 40mpg but I'm wondering if they make any difference at all. Thinkin about giving it a try cus they have a money back guarantee. Any body used one of these magical chips? http://cgi.ebay.com/ebaymotors/X-PERFORMANCE-CHIP-JEEP-CHEROKEE-1991-2009-HP-MPG_W0QQcmdZViewItemQQhashZitem3359616754QQitemZ22 0542887764QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAcce ssories

 

complete scam, you will not see ANY performance gains, let alone 130hp and 40mpg... i know someone who bought one just for grins and took the box apart, its just a wire running through a box

 

His had a wire in it!? I did the same thing for ***** and giggles and mine was just a plastic case with epoxy in it for weight!!!

 

i think it makes for a good ornament under the hood! haha.

i'm sure it will make a little difference in mpg gain of maybe 1 to 3. but there is no way that that little device will increase mpg to 40. if gaining 40mpg is true, then all the major auto corporations would realize that after many years of research and developing more fuel efficient cars for this day and age, that they have been missing this final link - which is the jawdropper performance chip.

but with the way gas prices are going up now a days, it doesn't hurt to try new products to save $$$ and increase mpg. i'd prob buy it just to check it out!!!

 

I wouldnt buy it. Its a weighted empty box with wire leads coming out. I cant believe these things are even still on eBay

 

agreed.