When I had my '02 Mustang GT, the Ford service advisor told me anything bolted directly to the engine (Underdrive Pulleys, S/C, Turbo, headers, etc) would void my warranty. Any thing else was ok. He even stated that my superchip was ok as long as I reset my pcm to stock before bringing it in. I asked my service advisor at the Chrysler dealership the same questions and he gave me the same answers. So it looks like my future Jetchip Stage 1 and CAI mods will be ok.
