https://www.motortrend.com/how-to/mopp-0207-intake-manifold-engine-and-rpm-range-test/

Per the above, the Performer RPM is a bit better overall than the CH4B. However, if hood clearance is an issue, the CH4B is closer to OEM height.

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)