Tires absorb some of the impact, so having low profiles automatically reduces ride comfort, not a lot, but it is noticable. You could change out to springs, but doing that is only done looking into the future i.e not having to deal with a sagging ass every few years because of air leaking out of the bags. Will springs make it more comfortable? Hard to say, some people say yes and some say no. If you have a set of factory wheels, (255/55/18) slap them on and check for ride comfort. As for a way to adjust air pressure, the computer handles that mess, adjusting pressure for ultimate precision. Air too low - pump inflates bag. Also, I am not a expert. Wait for JCL, Weasel, kill crap to answer. They should have a more definitive answer.

__________________

2011 E70 50i M Sport