Optima tuning mod; real or real junky?

A seller on Ebay is selling these things for $16.99 plus shipping. I have serious doubts and was wondering if anyone had some knowledge to lay down on this matter.
 
don't do it.. just a resistor you wire in line.... bad for car, and the ecu will learn around it probably in a little while anyways......
 
I have a corona bottle Ill sell you for $10 shipped, toss it in your engine bay and you will get the same gains as that "chip"
 

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