Well, I'm not at liberty to quote the letter or the source of course, but it's safe to say that the ITAC and CRB have received mostly positive response about ITR, except from BMW drivers, who have told us that they do not like the idea of being "forcefully moved" against their will, as one letter writer put it.
Others have said they would like dual classification for their cars. Interestingly, none have asked for categorical dual classification for all cars currently in ITS. And others say the car is too heavy to compete, but it can't make the weight as listed.
Yes, I found the $11,000 quote to be a bit 'stout'. He was adding all the money spent on the SIR, a new rollcage, complete engine development post SIR, all new wheels, (multiple sets) and tires, plus new spings, damper and rollbar settings and testing, (off the top of my head).