What handling trait are you trying to cure with aftermarket anti-sway bars?
If, as you said, nothing you've detected yet, then you should keep that money in your wallet.
It's that mindset that keeps tuners selling people parts they don't need.
I've done over 200 on track miles in my ST and couldn't (if paid by a Tuner) come up with a reason (yet) for anti-sway bars or shocks and springs. The car, on factory tires with factory brakes performs at a level that I find to be above the skills of 80% of buyers that might find themselves on a race track with it.
Yes, put r-compound tires and things change. Yes, stiffen it up (as I would even like) with some proper shocks and springs and the balance might need some tuning, but if you're just looking to add to (or create) a mod list, then the suspension is the last place to look on this car.
You should be several thousand dollars deep into shocks/springs, tires and brake pads before you truly find a need for further development on the chassis behavior.
Just my humble opinion, but, again, I'm not trying to sell you anything.