No idea about the F30, but my E90 door locks are LOUD. They, together with the car's flashing lights are a very good audible (and visual) confirmation of the car locking. Been perfect for me for the past 7 years.
I haven't purchased an alarm for any of my 3 BMWs that I have owned. Not buying one for the F30 either.
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328i M-Sport, Estoril Blue, Carbon XP 35 Tint, front heated seats, black Dakota, Sports Suspension, Anthracite Headliner, HUD, Pro Nav, Sunroof, hk 600w, Bi-Xenon, 19" 403M wheels, Reversing Camera, DAB+, Xenon, BT Ext Connect, MST turbo intake pipe, MST Cold Air Intake, JB4 on Map 2 with Catless DP produces awesome performance in Sport.
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