1. Warranty won't be a issue with a direct bolt on intake. If your that crazy you can just remove it before it goes in for a service. If your willing to change the cats, I don't why you would worry about intakes.
2. There would only be a couple of HP in it for the k&n filter or maybe none. Maybe it's not worth doing unless you wanna save coin in the long run and re-use the filter.
3. It's for headers.
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