That one isn't. 6.1, good heads, and the tall mf-er intake with a dominator on it.
Out local hellcat (of whatever varient) guys run 5s too, at about 1500 more pounds than that dart. Fastest of our three regulars run 5.30s, slowest runs 5.70s.
The Dart runs n/a 10.5, but isnt competitive. (It is a VERY competitive bracket combo, however!). A good friend of his is 2023 champ with a big inch W8 combo.