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I looked at a 550i when I was back in the States and it looked like the valve mechanism was separate from the exhaust tips. Didn't have a lot of time but will definitely look closer when I get mine delivered next month. I've asked the BMW dealer in town if it could be done but no answer yet since they don't have a 550i to look at. I think the current diffuser would also work with dual round exhaust tips if they could just be changed out.
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