[visualguy]

Does anyone have any insight into the reasons BMW never offers active anti-roll bars (ARS - Active Roll Stabilization) and rear wheel steering (IAS - Integral Active Steering) on the M5? They do offer these on some other 5-series cars, such as the M550i.

Porsche offers these as options on some of their sports cars, so these can't be inherently bad for sporty driving, or weigh too much, or such thing...

Aren't active roll bars superior to passive ones in achieving a better balance between comfort and grip when the car isn't turning and roll stabilization and grip when the car is turning?

I started thinking about this when noticing that they offer the base M5 with softer anti-roll bars, and the M5 Competition with stiffer anti-roll bars. Wouldn't having active anti-roll bars instead be better?

Any suspension experts here? I'm wondering why BMW's and Porsche's philosophies diverge on this.