Well, I got a chance to try my new shoes out at the track this weekend:
18" Purners with Goodyear Eagle slicks mounted. My best laps were 1:21 (which is hauling at MSR), and would have been faster without all the traffic. I also put the hurt on the rest of the competition:
In case you were wondering, the witty comentary is provided by my passenger, one David Tittle, himself... The grip of these tires is amazing- you add about 580rwhp to these slicks, and you can carry some Gs through the turns!