Another vote for BMW Performance Exhaust. I miss my G37 exhaust note (far from a Jap piece of crap, for the record). Just about to order mine from Tischer as I type this!
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2014 F30 M-Sport 328i, Estoril Blue, Sport Auto, Moonroof, Lighting Package, Navigation, Harman Kardon, Black Performance Grilles, Stainless Pedals.