I agree, and I don't' agree
. Your 100% right on the Airaid side of things. Roush = Airaid as a CAI is concerned.
Your other statement is where I get mixed answer from dealerships. Some Ford dealers in my area have told me if I touch the stock tune and anything goes wrong with the engine and they said anything, they will not warranty it.
However I was also told (by a smaller Ford dealership) your quote of unless the aftermarket tune, is proven to be directly responsible for causing the warranted parts in question, to fail..
So I'm on the fence on that subject I and would venture to say to check with a few local dealerships to get a feel for their responses!