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This 2.25" diameter Cat-Back™ system features a Merge X-Pipe for increased performance and improved sound. The exhaust exits thru single 4.5" round polished T-304 stainless steel tips on each side for a sharp appearance. The system contains BORLA'S Polyphonic Harmonizer Technology which utilizes patented units that contain pipes of different diameters and lengths to create multiple exhaust notes that harmonize to deliver a clean, rich, full-bodied sound to the BORLA®