The Thrust arms do not appear to be a straight swap. From my rough measurements, the front bushing is a fair bit wider on the 228i and appears to be a slightly different diameter, so you can’t just press the 228i bushings in the F8x thrust arms. This could probably be solved with some spacers on each side of the bushing. This is something we may look into further in the future.
However, it seems to be a small enough change in length to just the lower control arm that it shouldn't require the tension struts to be changed. It obviously fits just fine with just the lower control arms installed and the wheel stays located in the middle of the wheelwell. While it theoretically will have a slight effect on caster and upright pivot point, it is such a small amount that it shouldn't have any negative effects. When we put the car on the ground, steering effort and feel was similar to stock but that is hard to judge with the electric steering. We have not had a chance to test these out on the track yet but will do a full report when we do.
Regarding the Headlight leveling sensor, unfortunately our 228i is a base model and does not utilize the headlight leveling sensors. Presumably, it would just require the shorter regulating rod from the M3/M4. You can see the different designs here:
2-Series:
http://realoem.com/bmw/showparts.do?...48&hg=31&fg=05
M3/M4:
http://realoem.com/bmw/showparts.do?...26&hg=31&fg=05
The part number for the F8x regulating rod is 37-14-2-283-867.
Also, you'll definitely need to correct the toe with an alignment after installing these arms.