I'm interested in hearing if anyone has experience with the M/T ET Street S/S 275/60R15 which replaced the original ET Street Radial. I know the S/S has a lot more grooves to improve wet road drivability, but don't know how changes between the original and the S/S series have affected on-track performance.

I have some experience with the S/S in the (now discontinued) 305/40R18 size on my 2021, but the old car and the new car are so different that I don't know how much that matters. On the 2021, I'd say they work... "OK"... but not as well as I recall the original tires worked on the '73.

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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)