It may be a stretch, since I doubt you can actually get one without markup. Even at 100k, don’t think any car at that price range in stock trim can even come close in terms of track performance. Come to think of it, the R35 would be an even bigger bang for the buck if the bang is track performance.
I have no doubt you can mod a Z06 to beat it, just like you can mod a plain C6 to beat the ZO6.