If you are an average driver with no real RWD experience at the highest level, you would be hard pressed to beat an ITR with the RX7, track depending.
The ITR is so easy and user friendly at the limit and it can be pushed right from the get go. Whereas the RX needs a confident experienced driver to extract the best.

Yes indeed at the national level Autocross events the top drivers in RX7 beat the tops in ITR's but in every day driving with every day people, the ITR is hard to beat.