Per
https://www.caranddriver.com/reviews...ic-test-review the 991.2 C2S traps 123 in the 1/4, that should give it a pretty good edge acceleration rise (from a stop and roll), and seat of the pants wise it should feel significantly quicker as well
Same mag got 119 in the 1/4 for the MY15 M4
https://www.caranddriver.com/reviews...ic-test-review