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For what it's worth, the M-performance exhaust on the 535i is a complete positive. At no point does it intrude or drone, just a bark on start-up but even stock is a bit loud when first turned on. Of course, that's a very quiet car, n55 vs. b58 and MPPSK may be a different beast... That said, if I knew if the MPPSK for my f30 b58 was similar in sound to the f10 n55; I would do it. I kind of miss it.
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