according to the ETK (
www.realoem.com/bmw), the m coupe and m roadster bars are the same size (18.5mm), certainly larger than stock (14mm) and sport (16mm) bars for the ti. bmp design offers h&r anti-sway bars, 28mm front and 18mm rear. anyone used these bars (including reinforcement of the rear trailing arm mount points)? looks like it would be around $400 for the pair.