FWIW, I talked to Sean at Dynamic and asked him if they'd recommend an 8" to better suit the new engine combination than my current 9.5". Surprisingly (to me, at least) he said they'd stick w/ a 9.5" but build it with a different stator (and?) to account for the change in HP & torque curves.

I also e-mailed the ATI tech folks asking about one of their 8" Treemaster converters; not sure when I'll hear back on that, but I'm curious what they say. work ATI's maybe 60-65 miles from me, so they're not too far away.

2021 Challenger 6.4L Scat Pack 1320
100% stock: 1.680, 11.894 at 113.75 (DA 175 ft)
weight reduction, wheels, tires, Hellcat air box: 1.661, 11.686 at 115.97 (DA 710 ft)

1973 Challenger 452 ci street/strip [2008]
pump gas, DOT radials: 1.454, 10.523 at 126.44 (DA 514 ft)