Hello to all. I'm a new owner of a 2007 HD Duramax. Extended Cab 4x4. Has anybody tried the Superchip 2808 Flashpaq Tuner. Also do you need anykind of tranny upgrade to run the tuner. Being new to a Chevy what kind of power upgrade can I use that I could put back to Stock if any problems arise. Thanks

You will be fine running the superchips on the highest setting, If your concerned about hurting it buy a transgo jr. You can get one on ebay for about $70, protects the tranny and makes the shifts feel alot better.