I'd have reused the Mr. G's with the same spray coating, except I figured out I needed to use the 4.50" instead of 4.41" while it was torn down. The price difference was moot at the time, so I decided to give the Cometics a try. Still have the Mr. G's hanging on the wall in my garage, FWIW.
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)
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