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This is my first post here. I have owned my M5 about a year now and I love it! I came from the E36 M3 world and although I miss that car the M5 does a lot of things well. I recently installed a cat-back exhaust system and I wanted to give a review on my experience so far with this exhaust. It's been on the car for several weeks now and I love it. The build quality is great and the finish is very highly polished which may not be the taste of some but I like it. There is no drone at cruising speeds and similar to the muffler delete, its quiet unless you get into the throttle. I'll attach my video along with a few pictures. Overall I am very pleased. Great product for the money.