Just to compare, E46 stock sway bar sizes:
Quote:
1999/2000 Standard......Frt 21.5mm...Rr 15mm
1999/2000 Sport...........Frt 24mm......Rr 19mm
2001+ Sport................Frt 23.5mm...Rr 18mm
2001+ Standard...........Frt 23mm......Rr 18mm
Convertible..................Frt 23.5mm...Rr 20mm
M3.............................Frt 26mm......Rr 21.5mm
M3 CSL ......................Frt 30.8mm...Rr 22.5mm
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I just ordered the M3 coupe/sedan rear sway bar for E90, 22.5mm. I have a staggered set up and really hope not to do front at all. If it oversteers dangerously, I WILL get M3 Front.