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If you have the Msport option the M6 rear diffuser is a direct fit. You can get carbon one piece diffusers from ebay or alibaba for around $350 , but fitment isnt perfect and they need to be urethaned to the bumper. I bought a one piece polypropylene version that fit ok, still took some effort to make it fit, and i needed to be painted.
If i were to do it again I would get the factory painted M6 piece (can be found new for under $200) and then add the carbon center diffuser (many to chose from).
A muffler delete will not cause any issues with the vehicle, with the possible exception of it being too loud.
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