From a pure performance standpoint, your C5's stock "H-Pipe" just doesn't make the grade, as the path of exhaust flow and any crossover gases must cut a 90-degree corner, which hinders the crucial balance of backpressure. This full length, 2 1/2" X-style pipe from Billy Boat Performance Exhaust is made of 16-gauge 304 stainless steel and bolt on with fully illustrated, step-by-step installation instructions provided. Includes the band clamps, new flange bolts and gaskets.