OEM fitment Nexen (Korean) 275/40R20 "Drag Spec"
They're not as soft as the M/T ET Street S/S, but probably last longer. However, all the 20-inch DRs are cursed with extremely short sidewalls. A lot of people change to 18" or 17" wheels to run tires that have taller sidewalls and improve consistency.
EDIT: Found this pic on the track's FB site. That's the last "good" run we made (11.92) and there was a really sweet A-body fastback Barracuda in the other lane. I don't know if they're someone who also posts on Moparts, though.
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https://www.facebook.com/ItsTrickyFilms/photos/pcb.151177707268278/151172243935491[/img]