The chip actually works. Another member posted about it in his thread. I am selling it because I got the trifecta tune-which I regret only because of cost vs what I got. The Jet chip really makes a difference in passing times on E way driving. Most people bad mouth Jet but have never bought one, Id guess about 10-12 percent gain is accurate, but my MPGs dropped only because I was driving harder to utilize the chip. It plugs into the ECU port in the engine bay and takes about 5 mins.