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The MRT "MaxFlow" H-pipe is the only Mustang performance h-pipe exhaust system on the market with that muscular sound all performance enthusiasts love. The MRT H-Pipe deepens your exhaust note and improves the flow of exhaust gases by maximizing mid-pipe system volume. The MRT H-Pipe produces an increase in horsepower, torque and fuel economy versus comparative X-Pipe designs, while still sounding muscle car tough.