ir_fuel

Same reason all those cars you mention have traction control and the Cup hasn't. Gentlemen drivers with deep pockets that want to race fancy GT3 cars but can't be bothered to learn how to drive properly.

Porsche decided that for their Cup series it's the driver that should do the work, not the car. And as said here above. They are built for sprint races. Thats 25 minutes of driving at 101%. Don't need all that fancy schmancy stuff to save you there. It's not as if you are going to run for 60 minutes on a semi wet semi dry track, have to do emergency braking because a car in a slower class didn't see you coming etc etc, stuff which you can encounter during endurance racing.

IMO the only electronics a GT car should have in endurance is ABS. All the rest they should get rid off. But that's not going to happen soon I guess.

I wouldn't say it separates "the men from the boys" as it isn't inherently something related to risk, but thanks to this "dinosaur" approach to their race car you can be pretty sure that whoever you find at the front of the field in no matter what Carrera Cup or the Super Cup is one hell of a driver.

MirageJHU

You can get one for this upcoming (2017) season if you are signing up to compete in IMSA GT3 Cup for the full year. Otherwise you'll have to wait until 2018...

JCL59

Confirmed by truspeed when I inquired about potential support for 997 in 2017.... 7.2 cups no longer elidgible for imsa cup gold class. 991.1 will be gold 991.2 platinum. Definitely see gtc5 growing next yr..