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If you're worried about the warranty, you're always going to be at a disadvantage. Your options are limited.
As for getting 400+ HP to the wheels, good luck. Even with full bolt-ons, I was only in the 350's. That seemed a little lower than the norm, which is maybe 360-370.
I would say that you'd either need to do a cam, or go forced induction. Your other option, that'll probably cost a lot less, is nitrous. I have a feeling that would not help your warranty situation, though.
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