I am experiencing the same OP described and I am researching for options to fix it:
1. 12 mm spacer on the front wheels. I want to spacer on the rear wheels for aesthetic purposes. I am thinking 18front/15rear or 15front/12rear. Do you think I need bigger difference like 18front/12rear?
2. Tire pressure. The Owner's manual states two different pressures for the rear tires??! Below is for staggered tires:
Tire inflation pressures X1 sDrive 28i
Tire inflation pressure values up to 100 mph/160 km/h
Front: 225/45 R 18 91 V RSC: 2.4bar/35psi
Rear: 255/40 R 18 95 V RSC: 2.6bar/38psi
Tire inflation pressure values over 100 mph/160 km/h
Without high-speed tuning feature (<-WHAT IS THIS???)
Front: 225/45 R 18 91 V RSC: 2.4bar/35psi
Rear: 255/40 R 18 95 V RSC: 2.9bar/42psi
3. Sway Bar. Nobody mention it in this thread but isn't this only for stability in turns at high speeds?
4. Lowering the car. Not an option for me since I don't like the look.
I would like the knowledgeable people to elaborate (not so knowledgeable like me can too
)