It was my first time changing a cars ECU so I was a little skeptical about doing it. Did research for months till I finally got over the fear. If you don't have the money/time to be going to a shop to get your car tuned this is a MUST! The car's difference is like black and white. Also giving you the option to run on E85 is a plus. Lemme just tell you it can be addicting. Wish there was a lot more ethanol pumps but it is what it is. If you have the OFT and are scared to try E85 believe me it is totally worth it.