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Giving this thread a bump. In the process of creating a duct for my PFS SMIC and Airbox. It was determined that I wasn't going to plumb the airbox into the IC duct. The PO of the airbox had cut two large holes in the bottom. I contemplated repping the FG part of the box out of alum but realized it would be a miracle to pull that off. So I checked and measured and determined I could use the mod in this thread to my advantage.