The parts I was referring to were mainly brakes actually. Rear disc conversion and some better brakes up front (rotor over hub conversion). Only non-braking system part is maybe a rear sway bar (car didn’t come stock with one), mainly to make the car more fun and reduce understeer/cornering on the wing mirrors. That and a couple repair parts/general things a 14 year old car needs.
And the thought of a Ford Five Hundred going around a track is makes the part of my brain that I use in physics classes hurt a lot.