I would broaden your search as far as exhausts go. Both the Stillen and Borla are nice exhausts, but there are so many out there to choose from. As far as the intake, if you don't mind removing the front fascia and cutting some stuff yes, the Stillen G3 is a great setup. Some other people use SRI and others are using tubes + drop-ins. An ECU tune isn't really necessary unless you're running lean (ussually G3's HFC/TP and catback exhaust combined). Anything can technically void your warranty if they can prove it caused a problem.
I personally have a berk exhaust and love it. I've heard many other exhausts as well that sound great. It's all personal preference based off of needs and wants.
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