A larger front sway bar would help with understeer. Also adding some additional negative camber in your front end would help. Some might tell you that the rear sway bar needs to be larger, but that actually does not have as big an effect as the front. Increasing the FSB helps maintain the dynamic camber on the front axle allowing for a more solid contact patch on the tire through the turn.
I don't know of any aftermarket bars though.
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