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Magnaflow CatBack Exhaust System Application: Mazda 6i (2.3L) Part Number: 15803 The Magnaflow Cat-Back exhaust system for the Mazda 6i has a dual rear exit. All Stainless Steel, Mandrel-Bent, Cat-Back Exhaust System With Polished Stainless Steel Tip. 5x8x14" p-SS muffler, 4x4x14" p-SS resonator, 2.25" SS tubing, 4" rolled/slash/p-SS tips