Originally Posted by chromisdesigns
Try upping the pressures if you are still running the same as the old runflats. You may find you don't need a suspension upgrade at all -- the OEM pressures help to counteract the bad runflat ride, but are too low for the softer conventional sidewalls. Try 38 all around and see what you think, before you do anything else.
I just got my Michelin PSS about 3 weeks ago, feeling a little soft, plan on changing up the pressure next time I'm out. I'll try 38 and see if I notice any difference, pretty sure the shop put it at whatever OEM specs said