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DIF 10004 2.5" Universal 2-Bolt Exhaust Flange (3/8" thickness) is designed to allow TRUE 2.5" tubing (up to 16 gauge, or 0.60" wall thickness) to slip fit the flange, providing a flush and uniform finish - see drawing image for example and dimensions. Flanges are made from a sheet of steel and not casted to provide flat surfaces in order to prevent exhaust leaks.
Each flange is laser cut for precision, accuracy, and consistency. Required item for all DIY'ers who want a 2.5" custom exhaust.