The Ford Thunderbolt. A completely stock 'bolt, on modern tires, will run around 9.3 second 1/4 mile times. The fastest 1/4 mile time ever for a factory vehicle.
Thunderbolts were fast, but stock ones cannot run 9.3 ETs.
The best NHRA teams managed to get low-11s from them at best. That’s fast but they were not nine second cars.