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I'm in the process of doing this mod myself albeit with a smaller 2.5" diameter intake tube. I've already used a hole saw and cut the hole in my airbox and test fitted the flange but the problem i'm running into is that the mating surface on the inside of the airbox where the flange goes up against the wall of the airbox is not even. I think I may just try to sand down the high side and even it out but was wondering what others have done. You'll see what I'm talking about if you look inside the airbox on the side that the hole goes on; it's like one side is stepped higher than the other up to a certain point....I guess I could also just kind of form it up with rtv silicone but then i'm worried about that junk eventually disintegrating and making it into my engine or turbos as posted above....
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