I'm pretty sure it was Pirellis, if you look closely at the shot 40 seconds into this video the car has Pirellis' on it. I can tell from the sidewall they aren't hoosiers, and there's no grooves in the tires like the hoosiers have. Being the car has Pirelli's stock it makes sense they ran Pirelli slicks. How much faster are the Pirelli's over the Hoosiers?
https://www.youtube.com/watch?v=DLa3l_UX77c
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