From what I've heard, the track prep makes a huge difference. I've talked to many people who run 2.1-2.3 on street legal night and can get into the 1.9-2.0 on test and tune days. Radial cars chew up the starting line pretty badly so it may have been from too many radial cars. There must've been some pretty mean track prep to run 1.7's on regular radials, I've never seen it been done at either of the tracks I've been to.
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