Originally Posted by bigjae1976
Typically in an E46 (suspension design is not that different, right?), most run the biggest front bar possible and a smallish rear bar. Some even skip using a rear bar..all in the name to banish understeer. Sheesh, Turner sells a 40mm front bar. If the normal thinking were to hold true, wouldn't a 40mm bar render your steering wheel useless?
I think the main difference with the E9X is that you don't have to do nearly as much to get the car close to neutral.
E46 front suspension is very different from the E9x, as different as two mcpherson strut setups can be anyway. Take a look at the knuckle design and the lower control arms. The correct answer on an E9x doesn't appear to be to stop the suspension from moving so it can't screw up the tires, though if you're stuck with soft spring rates for whatever reason, a stiffer front bar does help