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You are basically stuck with a RF CAI, ported stock IM/TB. Everything else will require a tune. Once you are tuned your warranty is gone. To notice the ported IM/TB they would have to pull the car apart. Even then they most likely won't notice the IM. Once oil covers up the porting you have to know what you are looking for. The CAI you can swap back and forth for the dealership.
I still recommend a tune with any mods but it isn't necessary with what I listed.
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