120psi isn't possible on any car tire I've ever seen...... I think the factory setting is 32/32 but there isn't a set in stone psi. How do the sidewalls feel to you during sharp turns? If they are rolling under just add more air 2psi at a time to fine tune it until it feels right for your driving style and needs. Just check the sidewall for max pressure again, and keep your cold pressure a good 10psi under that as you make your adjustments. For example, my Proxes 4's have a sidewall max of 50 and i run them at 38/40 cold psi due to their soft sidewalls and my dislike of slowing down for corners.
