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The BMW M5 Magnaflow Catalytic Converter is an important part of your BMW's emissions system. Out of sight and out of mind it quietly performs its job, which is very complex and interesting. The Catalytic Converter converts harmful chemicals in your BMW's exhaust into substances that are much less harmful to us and the environment. Few are really familiar with how the catalytic converter works, as long as it continues working! Suffice to say it is a fascinating process. But it really becomes critical if your BMW M5's Catalytic Converter is not working. Whether it is due to damage from debris that has bounced up off the road, overheating, contamination or cracking of the shell due to a hot converter coming into contact with cold rain or snow, a failing Catalytic Converter will be evident by a decrease in your BMW's engine performance or a decline in gas mileage. If you experience any of these symptoms with your BMW M5 you should have your Catalytic Converter checked and replaced, if necessary. Your BMW M5 is a quality machine, designed for the ultimate performance and classic good looks. These are the reasons you bought a BMW and you do not want to compromise any of these qualities by installing parts that are not on a par with your M5. By choosing a BMW M5 Magnaflow Catalytic Converter you ensure that you can count on a Catalytic Converter that has been made with a focus on high quality and because Magnaflow is experienced in making parts for BMWs, you can be assured of proper fit and function, as well as ensuring the quality and durability of the part is appropriate for your BMW M5. Auto Parts Network (APN) has the BMW M5 Magnaflow Catalytic Converter. We provide the very best customer service and have knowledgeable experts available to help you choose the right parts for your vehicle. You know you can trust APN to always provide you with the best service, competitive prices and the best selection of parts available!