The only purpose a sway bar on a car that it used strictly for track is for fine tuning.
If you spring rates are set up correctly you should not even need a sway bar.
But no track is the same and conditions change as the day goes on.
I have seen many a cars disconnect the rear sway bar because the car felt better and went faster on a particular track and day.
The manufacture puts sway bars to improve handling with out sacrificing ride.
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