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I just received this C63 (accepts quad exhaust tips) carbon fiber fin diffuser and it installed flawlessly. Paid $400 and had a little bit of an overseas wait time. I'm only accepting PICKUP at this point. I want to get a different version of the diffuser that I found after purchasing this one haha.
Price is $325 FIRM. Save yourself the hassle of a piece that may not fit correctly, and the shipping time.
Located an hour west if Philadelphia in zip code 18944.