Chris - the Flasher is much better. Wayne can program it for the stock tune and a performance tune. The chip, will void the warranty, as it's pretty easy to see if you have it installed by pulling out the ECU. And if you do remove it, if it's the same as other years the back of the ECU, will have the door missing where the chip goes. Dead give away the ECU has been tampered. Also, if Ford does a program upgrade to the ECU you will have to send the chip back for reprogramming. With the flasher you will just need and updated tune which can be sent to you via email. If you have any warranty issues, you can reload the stock tune back to the ECU.