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We hooked the headers to a Flowmaster '64-'72 El Camino exhaust kit. It includes the H-pipe, the 2.50-inch tubes, and the 3-inch tips that exit behind the rear tire. The 50 Series mufflers are mellow at cruise and crisp at full throttle. They idle with a musclecar burble, even though the engine is fuel injected and lacks cam chop.