NPR has been an OEM supplier for many Japanese brands (car and motorcycle) for decades, IIRC. Quality should be right up there...
Gaps shouldn't depend on brand; check whatever the recommended gaps are for rings w/ your bore size w/ different companies and I'll doubt you'll find much difference.
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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