its all personal preference. Personally for me, i liked the sound (esp the bms because it was quieter), but after a while it did bother me because i have a 6at so i ended up buying an aftermarket filter.
The injen intake on the other hand made me lose power and sounded obnoxious and the fit was awful.
Current: 2013 335i 6mt msport
BMS Clutch Stop, JB4, Slightly Modified OEM Muffler, ER Downpipe
Past: 2011 335i coupe
369 whp/444 torque. (Procede
, Custom Turboback Exhaust, BMS Intake, ER FMIC)