I'm no genious but I think that's fake. Personally I wouldn't buy any electronics, especially not for my car, off of e-bay, there are too many scammers. You know that list that pops up when you get on the main page? I was checking that out and they had the sport chip mod which takes away the revlimiter and adds horsepower, (well, maybe not the chip, but a fake version of it) On sale for SIX BUCKS when it normally costs 200.
Yep, worthless in my opinion. they are just a resister to put on the car to trick it into putting more gas in. there are a bunch of different listings on Ebay for this, and if you take a little time, you will notice they all look similar if they included a picture.