That sounds about right. I ran a ~13.7 or .8 @ 99 mph in my wife's '11 335xi 6MT. The few mods I have are listed below. This was at ~2,300 FASL. So converted to sea level, not too bad.
Grey Matter:2008 E92 M3:608/425. SG/PS SOLD!
Dark Matter:2015 F80 M3:495/505. AB/CB