Magnaflow Mufflers are the straight Wide Open performance muffler with smooth deep tones. First and foremost the Magnaflow muffler was developed to be a superior product line of performance mufflers. Wide Open performance Magnaflow mufflers outflow OEM chamber style mufflers by as much as 16%. This reduces engine heat and backpressure and improves exhaust scavenging from the combustion chamber. Magnaflow muffler minimizes the power robbing effects of the OEM system to restore torque and horsepower to the engine.