Originally Posted by GTM_Challenge
From a general suspension set up standpoint, no - not unless you're getting oversteer on track.
As mentioned before, a front sway will usually cause the car to understeer more - something you dont want if the car is set up to push from the factory anyways.
However, as seen in the thread, some people are reporting that a front sway can cure an understeer issue. I've not experience this myself. Your results my vary. My general suspension setup knowledge leads me to say that a front bar would cure an understeer issue, but i've never tried to fix one with a front bar - always a rear bar or alignment setting.
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.