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aFe Magnum FORCE Replacement Coupling Kit for (3-1/4 IN ID x 2-1/2 IN L) Straight Bellow-Coupler Blk Fittings Revel GT Design Kick Panel3 1 4 IN Internal Diameter: This 2 1 2 IN long coupling is designed to connect to a tube with a 3 1 4 IN diameter. It's commonly used on aFe POWER cold air intake systems, but can be used for a variety of projects. Flexible Bellows Silicone: Its bellows design is extremely flexible, making it easy to install, even when dealing with misaligned tubes. It allows for ample expansion, movement and vibration in between two hard pipes. Stainless Steel