Ive been looking on EBAY alot recently and I saw two kinds of chips. One of them is only 28 dollars, it says it is a oxygen sensor chip. Here is a link to it. http://cgi.ebay.com/ebaymotors/20HP-...QQcmdZViewItem
Its hard to belive that something that only cost 28 dollars can increase HP 10-15%. Do you think this will work like it says??? Also I see things about putting resistor onto ur cars intake tempature sensor. It says that is makes the car think that it is 32 degrees out. Says that it increases 20HP from doing so. What are your thoughts on this??? http://cgi.ebay.com/ebaymotors/20HP-...QQcmdZViewItem
There was another chip on EBAY that was a computer chip. Its was 75 dollars, it said that it removed the speed limiter and improved fuel mileage and all this other stuff. The bidding has ended on that iteam now though so I dont have a link to it. Hopefully the person puts it back on EBAY soon though because I was interested in it.

 

Don't waste your money or endanger your car with ebay junk. Even they real chip replacement sets are like playing russian roulette with your car. I rechipped my SL600 with $190 each chips for the ECU and it fried my electronics and cost a ton of money to get fixed. The cheap ones like you mentioned are just a resistor and a reostat that does nothing but gets them 10 times the cost of the parts used.