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Fitting a back box to your Civic is the perfect way to improve the exhaust note of your car, with its free flowing design also enhancing throttle response. All of our exhaust back boxes are designed to be direct OEM replacement parts for quick installation and secure fitmentFeatures:Manufactured from T304 stainless steel2.25" bore with 1 x 4" tailpipeTIG welded, CNC machined flangesPerformance back box enhances your exhaust noteFreer flowing than OEM, improving throttle response