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I stand corrected on the battery. My truck came with smaller civvie batteries, and with the battery all the way to the outside of the tray the hose barely fit past to the inside, so I assumed the larger battery wouldn't work.

Your second idea (larger oval hole in stock filter ass'y then a snout to transition to round and a 4" hose up to the knockout) is exactly what the Banks Ram Air system was. Also included a larger single exhaust. Long discontinued, but you can find them used occasionally. I've got the intake...