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Single Tip Exhaust System The PERRIN Performance™ WRX cat back exhaust system is constructed of full 3" diameter, CNC mandrel bent, 304 stainless steel. This fully flanged complete cat-back unit insures leak free function. The PERRIN™ exhaust system directly bolts-on to stock and aftermarket down pipes using all existing mounting hangers. The straight-though, huge, 3.5" inside diameter PERRIN™ muffler creates maximum performance and horsepower while emanating a deep exhaust note. This PERRIN™ exhaust features a single, 4", slash cut, stainless steel tip and a high polish, strait through muffler.