I've noticed neither of my 135's being especially quiet or well-insulated from road/wind noise, but it's not objectionable either (to me). Most of the time I have the radio on or windows down to listen to my sweet exhaust (PE) anyway, so I don't really notice it.
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"Prius" is Latin for Eunuch.
"Hrothgar": 2012 135i: 6MT M-Sport, BSM/Blk; Nav, Premium, Convenience, HK
Dinan Stage 2 +PPK /// BMW PE /// VRSF CP /// K&N /// Koni Sports /// RSFB Inserts /// MPS4S 225/255 /// Other Stuff
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