I am running the ACS Race muffler which is essentially made by Remus, and I feel a good gain in the mid-high. The rpm does not feel as restricted as before. Definitely a gain IMHO. Only loss is that its a cop magnet.
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2018 F80 LCI II ZCP ///M3 Mineral White M-DCT| Sakhir Orange Interior| |M Performance Exhaust|
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