The real 991 GT3 Cup has an auto-blip function for downshifts, but in Assetto Corsa, depending on your assists settings, you must be careful.
One reason the keyword is searched so often is the confusion over engine braking. In a normal GT3 car, you stomp the brake, downshift aggressively, and the ABS/TC sorts it out. In the Cup car, engine braking is a weapon and a curse. assetto corsa ks-porsche-911-gt3-cup-2017-rpm
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While it has ABS, braking still requires precision to avoid locking the rear and unsettling the car's balance. The real 991 GT3 Cup has an auto-blip