Six real, named S2-class vehicles cross-checked across independent launch-window guides. Stat figures (Speed/Launch/Acceleration ratings, top-speed mph claims) are guide-reported, not pulled from an official Forza stat sheet, so treat them as a planning range rather than an exact number.
2024 Koenigsegg Gemera: 1,700 hp hybrid with a Speed rating of 10, Launch of 10 and Acceleration around 9.7 - independent guides converge on this as the best all-round S2 pick for events that mix straight sections with corners.
GT-R Black Edition R35 Forza Edition: Reported perfect 10.0 across Speed, Acceleration and Launch, but reviewers note it 'handles like a brick wall' - build it for drag strips and speed traps, not technical road courses.
2021 Mercedes-AMG ONE: A perfect 10 acceleration rating and F1-derived hybrid tech make it the most versatile S2 pick reviewers cite, but the free unlock path only applies if Forza can detect existing FH5 progression on your account.
2020 Koenigsegg Jesko: Guides list this as the top-speed leader at a reported ~281 mph stock, with Handling around 9.1 and Braking around 8.9 - strong enough that it is not a pure one-trick speed car.
2021 Hennessey Venom F5: The same source that ranks the Jesko as class-leading top speed separately calls the Venom F5 'the fastest stock car in the game at 304 mph.' The two claims conflict inside a single guide - treat both as needing an in-game speed-trap recheck rather than picking one as automatically faster.
2014 Porsche 918 Spyder: Cited as the beginner-friendly S2 entry point - AWD hybrid grip forgives early mistakes better than the RWD hypercars above while you get used to S2-level speed.