Overview
2020 SIERRA Cars #23 Yokohama ALPHA appears on the official Forza Horizon 6 car list as a R Class (track-focused) entry in the base roster. This page focuses on what the car actually means for everyday players: how it tends to drive in its class, where it fits inside Forza Horizon 6's Japan setting, how to think about a starting tune, and which other roster entries it naturally compares against.
If you found this page while searching for a single SIERRA Cars model in Forza Horizon 6, you are in the right place. Everything below is built around the official list fields (year, class, pack, manufacturer) plus plain-language player notes. We do not invent horsepower numbers, hidden upgrade paths, or unlock guarantees that the official list has not confirmed.
Background and Forza Horizon 6 context
SIERRA Cars is an Italian boutique builder of carbon-bodied track cars based around proprietary tube frames. The ALPHA used a Toyota-derived 2JZ-GTE inline-six on E85 producing over 1,200hp, designed specifically for time-attack events and Yokohama's tyre development programme in continental Europe. On the official Forza Horizon 6 car list this 2020 SIERRA Cars entry sits in the R Class (track-focused) bracket inside the base roster, which is the placement players come to this page expecting to confirm against the public source. Inside the same R Class (track-focused) bracket, the closest comparison roster entries for players are 2019 Apollo Intensa Emozione and 2019 Aston Martin Valhalla Concept Car, which is the R Class (track-focused) peer group this car is usually weighed against.
Driving feel in Forza Horizon 6
SIERRA Cars #23 Yokohama ALPHA is a carbon-bodied time-attack contender built in Italy — Toyota 2JZ-GTE-derived inline-six on E85 making over 1,200hp, sequential gearbox and slick tyres. In R-class events on Forza's road circuits the ALPHA behaves like a Pro Class WTAC car; Yokohama uses the platform for tyre development in continental Europe.
Where it shines
R class is at home on the dedicated road circuits and any event where downforce, tire heat and brake bias can be used. Avoid running R class on tight street routes where the car cannot stretch.
Tuning starting point
R class needs an aero-first mindset. Set differentials around how aggressively you trail-brake, and rotate compounds based on the track surface. Rear-wheel-drive cars want a softer rear and careful throttle on corner exit; pay attention to rear tire pressure especially on long Japan map straights.
These are general starting points only, not a guaranteed competitive setup. Forza Horizon 6 community tunes that already have hundreds of downloads are usually a faster route than building from scratch, especially if you are not sure of the car's drivetrain or aero behaviour yet.
How to get 2020 SIERRA Cars #23 Yokohama ALPHA
This car is listed without an add-on label on the official Forza Horizon 6 source, so we treat it as part of the base roster. Forza Horizon 6 launches on May 19, 2026, and before that date the public Autoshow may not surface every base-roster car yet — players asking 'how do I get this car, it is not in the Autoshow?' on Reddit or the Forza forums usually find the answer is 'wait for launch day or a post-launch update'. After launch, base-roster cars are normally available through credits in the Autoshow, Wheelspins, Festival Playlist rewards, or the in-game showcase that introduces new vehicles.
