From G-Force website
What can G-Force Performance Chips do for you?
Our vehicle specific performance ECU chips are custom tuned, designed and tested per application, providing the absolute best performance, power, and fuel economy for your vehicle. They feature an easy "plug and play" installation to your car's factory harness and maintain the vehicle's warranty with absolutely no negative side effects. This is a "ZERO" risk installation, and is guaranteed not to interfere with your factory warranty on your vehicle.
http://www.gforcechips.com/terms-conditions.aspx
Disclaimer
Our claims of gains of fuel economy and power and performance found throughout this website is based on direct customer feedback and not actual tests. The advertising found throughout is based on claims provided by customers just like yourself, who purchased our product and reported back the gains. Actual results may vary, and are covered by a 100% money-back guarantee.