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I have to say, I literally tried different mufflers on the car and the Dinan Cat Back were the only ones I felt kept the "German" sound of the car. I have heard many people liking the M5 mufflers as well. What I like about Dinan is they are a bit loud when car is first started, once it warms up, there is just a wonderful GROWL to them. So Drone at highway speeds becomes negligible. But, when you get on it, they Roar. Keep in mind that the 550 model has a vacuum flap on the 2 of the 4 exhaust pipes which opens and shuts to lesson/loud-en the car. Not all mufflers come with this attachment and i think it is a must for the muffler.
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