I am very happy with my Dinan exhaust. It's fairly deep, with only the axle back. I'm not sure I'd like it if I didn't have a tune that added the burbles and pops, though.
Absolutely ZERO drone. This was all I really cared about when looking for more noise.
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2014 335xi M-Sport 6MT: Estoril Blue II, MHD Stage 2+ , Dinan Exhaust, Dinan CAI, ER Catted DP, ER Chargepipe, AA FMIC.
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