That is what I've seen too. The sheet metal stuff doesn't seem to work very well for single carb. Works great for dual carbs. I think it is because the curved runners are too hard to make in sheet metal. It wasn't that long ago that I came across pics of a single-plane sheetmetal intake for the first time and didn't realize anyone even made them
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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