Having driven a 7speed 911 and a 7 speed C7, it works very well. 5 gears is definitely not enough. It would be great if they had the same ratio spread but make 5th 1 to 1 again and then still allow 2 over drive gears for highway cruising.
Not this specific one, but we did a Bartlett Lake drive and we do autocross every month. Next event is on the 14th of this month. You can go to AZSOLO.COM to get event details and register. Lots of Mustangs at the events