fr. and rr. sway bars

The Formula S has a factory sway bar. Would it benefit me to upgrade or stay with what's there? This will be a street car once I finish.
If you're happy with what you have, stay with it. IIRC, the bar is 1" in diameter. There is a 1.125" bar out there if you have more body roll than you prefer. If roll is more than you'd like and you are routinely experiencing understeer (too tight, in NASCAR parlance), then it might be appropriate to consider adding a rear bar.