We own the 28i --- and in Sport it's fun. BUT the downside, at startup and idle, and even some low end acceleration- you can clearly hear the 4 cyl vs. the 6 cyl...and it just sounds like you've been HAD by BMW. Doesn't sound like a BMW should.
Sounds aside, wish we'd gone with the 35i - the instant power, not having to search for it - and the sheer "fun" of driving a BMW. We got it 5/25 as a 2013 model - already want to trade it in; and we got it fully loaded too.
2013 X3 28i DSB/Mojave/FW
SA, CONV, CW I, PREM, PREM SND, TECH, HUD