Sprinkling rain came and went during the session, some drivers getting lucky with the conditions and others unlucky.
Kostecki, who was third fastest in regular qualifying, seemed to catch the very end of the best of the conditions.
He slipped and slid his way to a 1m39.521s, increasing rain shortly after he crossed the line meaning Anton De Pasquale and Chaz Mostert couldn’t chase it down.
“It’s a credit to the whole team,” said Kostecki. “We weren’t very good here in the wet when we were here last year. [Engineer] George [Commins] definitely tuned her up and she felt awesome throughout qualifying.
“To be able to do the lap in the Shootout with no mistakes was just awesome.”
De Pasqaule will start the race from the outside of the front row, falling just a tenth short of Kostecki, which was impressive given the deteriorating conditions.
Cam Waters ended up third, a gain of two spots compared to qualifying, while Broc Feeney banked a second-row start.
Will Davison and Mark…
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