does a tune void the warranty? i want to get a cai/sct combo pack but dont want the a huge issue with warranty. or is there a way hide that it was tuned after loading the factory tune. and of course switching back to stock if need be. any help is greatly appreciated. is the 87 tune any good from AM?

thinking about this kit from AM but it says for 05-09... what makes it so different and can it be alter by buying a part or something?
http://www.americanmuscle.com/ford-sct-0509v6-kit.html

thinking about a all ford racing theme