I agree the 3-series is not built for quiet. A friends 7 is amazing in that department. I prefer the loud exhaust note possible in the 335i. Overall have not noticed much difference from the E90 to the F30 by way of "noise" outside of the exhaust.
2013 F30 335i | Sportline | Imperial Blue Metallic | Black Dakota | 6-speed | HK | Cold | Premium | 19" Staggered Sports | M-Performance Exhaust
2009 E90 335i
2007 E90 328xi