 see how the car "rolls" to the passenger side when making this hard left. bigger sway bars reduce this rolling effect by transferring some of the load to the side of the car on the inside of the turn. this keeps the tires planted more evenly and distributes the force of turing better. very often in autocross you will see a car raise its inside rear tire completely off the ground when cornering. This is a big indicator for needing bigger sway bars.
Jeff Taggart 1992 300ZX N/A 
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