The 17's are very very good. They are MUCH better than Nitto NT555R's and I ran 1.68 60' times on those tyres. These are better again.
The group buy end date is in the first post. Quite a while between now and then.
Believe it or not? Ok, not. Unsecured bags of heavy shit are not allowed in a race vehicle at any level. Rules and regs, (particularly safety ones) are few and far between in Japanese drag racing.