Bully Dog tuning devices will not modify or delete vehicle emissions. Bully Dog products that are purchased comply with the Clean Air Act. Tunes that are preloaded in our devices have gone through hours of testing to ensure the safety of the drivers and the environment overall. Custom tuners are required to follow the guidelines of the Clean Air Act as they develop their own tunes for our devices. Register your device online at registerwithbullydog.com to get a free gift and access to the latest updates and information. For help with your device, visit bullydog.com and click Support. There you will find several tools and articles as well as ways to connect with our technical support team.