Ever plan on going around a corner? or accelerating with bravado?
I learned I REALLY needed SFC's when at autocross one event had two skidpads in one course (big O shaped corners where you go around the full circle). The skidpad was so hard on my mustang, chassis flexing, one front wheel skipping around while the other one stayed relatively planted, the ungodly understeer.... SFC's are absolutely worth the money.
Also when my car got 4.10's I lost all ability to launch energetically without roasting the tires and wasting the power, another sign the chassis wasn't doing it's job.
Coupes are stiffer, but they absolutely still need the help.
