Such a beau!!!
That last sentence really bears some scrutiny. "OK-ish" should be divided into two categories: performance and durability. I think performance-wise, the Z will still be quick, even though the contact patch will become smaller. The bigger question is how long will those tires last? Some competitors will have 3-4 sets of tires PER RACE. Usually, I'll have one set of used tires for practice and a new set for qualifying. That new set will have to last for that race after a single heat cycle in qualifying.Interesting reading!
I think the 245's will be ok (ish)
If exhaust heat is really a concern, I've found ceramic coating the headers makes a difference. Outside that, you could try using some heat shield material on the underside of the chassis.The Z cabin is hot with the heat from the exhausts - I have not done anything about it (and don't have a cool suit)
That will be something I need to address next year