GT500: 5.4L supercharged (~500hp at flywheel) 6-spd manual only. Brembo brakes: 14" front & 11.8" rear. Stiffer springs, larger rear anti-roll bar & front strut tower brace are standard. that's essentially the difference. the other differences are mainly cosmetic, i.e., front fascia, spoiler, wheels, interior trim.
The standard Roush Stage 3 package with a supercharger costs around $25,000 plus a donor Mustang GT. This particular Jack Roush Edition 2020 Ford Mustang is available at Karl Flammer Ford for $75,550, putting it in a similar price range to other used 2020 Shelby GT500s on the market. 775 hp and a 3-year warranty are hard to argue with and
yFo76P8.