I downloaded fusion and the program to customize screen. will this change anything negitive or reset anything because all is working fine but if I need to update for cleaner or better tunes i want to. Also I would like to change my background please help 2009 6.6 gmc slt dpf delete

With all of the options available on the CTS race, I can't imagine running into much that couldn't be fixed. Everything I've read says you should update periodically.