The idea behind chips I saw on ebay is to by-pass the air tempreture to make the engine feel like it's getting colder air therefore the ECU puts out richer mixture. But to tel you the truth I purchased one for less than 20$ (Under 20$ you can't dispute through PayPal) and all it was after I took it apart and broke the epoxie was a 33kohm resistor which you can buy for 9 cents. Left a negative feedback and called him a theif. One week later he had changed his nickname PowerPlus or something selling the same garbage. It was worth the 20 bucks just to warn the others. By the way this would be of no help in colder climates.