What kind of handling numbers would I be looking at with 18x7.5 wheels, 225/40R18 Pilot Super Sports, Koni Yellows, Road Magnet 1.25" springs and a rear sway bar?
I dont think anyone here has done any test and got numbers per say. All I can tell you is the upgrade you just mentioned will increase your handling, cornering, grip, and so on and so on.