Overview
In Forza Horizon 6 (FH6), the X Class designation represents the absolute pinnacle of performance. Cars in this tier reach or exceed a Performance Index (PI) rating of 999, meaning they have been tuned and engineered to deliver nearly impossible acceleration, top speed, and handling characteristics. These are the machines built for players who want the fastest possible experience across every environment the Horizon Festival offers. X Class builds often start from very high-end hypercars and extreme prototypes—vehicles with 1,500 horsepower or more, cutting-edge aerodynamics, and feather-light weight.
Unlike more common classes such as S1 or S2, X Class is not constrained by road legality or balance. It’s an experimental tier that lets you push the game’s physics and tuning system to its limits. This means that only a handful of vehicles can realistically reach and sustain 999 PI. Achieving X Class often involves race-level adjustments: full conversions to all-wheel drive, optimized tire compounds, maximum downforce, and sophisticated engine swaps. FH6’s expanded tuning model makes these high-tier builds feel more authentic and rewarding than ever before.
Best X Class Cars
The following cars represent the best current X Class selections in FH6. Each has distinct strengths, from top-end speed to nimble circuit handling. These entries dominate leaderboard runs across road races, drag strips, and hypercar showcases.
| Car | PI | Drive | Why It Works |
|---|---|---|---|
| Koenigsegg Jesko | 999 | RWD | Unmatched straight-line speed and precision aerodynamics; holds top speed records and remains controllable at extreme velocity. |
| Bugatti Chiron Super Sport | 998 | AWD | Stable and brutally fast; superior handling under high-speed braking makes it ideal for open-road sprints. |
| Hennessey Venom F5 | 999 | RWD | Explosive acceleration and incredible top-end performance; demands skill but rewards with record-breaking pace. |
| McLaren Speedtail | 997 | RWD | Exceptional top speed and balanced weight distribution; perfect for circuit runs with long straights. |
| Pagani Huayra BC | 995 | RWD | Light and agile, cornering faster than heavier hypercars; excels in technical routes and short sprint events. |
| Hoonicorn V2 | 995 | AWD | A raw drift-inspired monster; hyper-responsive steering and acceleration capabilities make it surprisingly effective on mixed-surface tracks. |
| Aston Martin Valkyrie AMR Pro | 999 | RWD | Race-derived aerodynamics yield extreme downforce and stability in high-speed corners; a track-focused contender. |
| Lamborghini Centenario LP770-4 | 996 | AWD | High traction setup with balanced grip; comfortable handling for less experienced X Class drivers. |
| Ferrari SF90 Stradale | 998 | AWD | Hybrid torque delivery provides instant power and precise throttle control; versatile across every FH6 driving discipline. |
These cars reflect the evolution of top-tier tuning possibilities in FH6. Players can further tune them for drag racing, road circuits, or cross-country events depending on how they adjust suspension stiffness, tire pressure, and aero settings. The Jesko and Venom F5 remain the most powerful in raw performance figures, while the Huayra BC and Hoonicorn V2 demonstrate how lighter builds can compete equally through superior handling.
Festival Playlist
X Class events feature prominently in the Festival Playlist for FH6, typically marking milestone weeks or special Series celebrating technology and speed. These races showcase hypercar categories or “Ultimate Speed Championships” that encourage players to test their fastest builds. X Class challenges often appear in seasonal championships, riviera road races, or multi-stage showcases where the player races against jet aircraft, trains, or drones.
Weekly Series sometimes restrict participation only to X Class hypercars, inviting drivers to complete precision speed traps, speed zones, and comparable leaderboard challenges. These playlist objectives usually provide unique cosmetic rewards such as exclusive liveries, rare wheel designs, or Horizon Edition vehicle versions. Completing these tasks also increases progression toward festival expansion themes, which shift from traditional racing to more experimental formats such as aerodynamic performance tests. Anyone intending to rank high on the playlist should keep at least one optimized X Class car in their garage fully tuned to accommodate the current season’s geography and weather.
Tuning
Effective tuning in X Class revolves around retaining control of enormous power. Because these cars produce extreme acceleration and torque, small adjustments can drastically influence drivability. FH6 allows precision tuning down to tire compound, camber angles, and active aero balance, so experienced players experiment frequently.
Key tuning priorities include:
- Aerodynamics — Run maximum downforce for corner-heavy routes and lighter settings for top-speed challenges.
- Suspension — Lower ride height and stiffen dampers to maintain stability at over 250 mph. Avoid full stiffness off-road or in rough terrain events.
- Gear Ratios — Fine-tune for acceleration in shorter races; lengthen top gears for highway records or speed zones.
- Tires and Brakes — Upgrade to race compound tires; increase brake pressure for more immediate stopping response at high velocity.
- Weight Reduction — Remove every unnecessary component to maximize handling responsiveness without disrupting balance.
Because X Class cars exceed normal track limitations, telemetry data during test runs becomes critical. Use the FH6 dynamic testing mode to review tire temperatures and cornering forces; adapt your setup accordingly. Many expert tuners save multiple profiles for different track lengths or weather conditions, switching through them before entering a playlist or Horizon Circuit event.
Best Pick
Among all contenders, the Koenigsegg Jesko stands as FH6’s most-recommended X Class car. Its record-breaking potential and refined road dynamics make it versatile enough to dominate virtually any event. Built around a perfectly balanced chassis and advanced active aero system, the Jesko combines raw power—well above 1,600 horsepower—with unusually manageable corner performance at ultra-high speeds. Once tuned properly to reduce wheel spin and enhance stability, it becomes equally lethal in drag races and sprint circuits.
From a competitive standpoint, the Jesko’s blend of top-end velocity and aerodynamic precision ensures sustained advantage across the Festival Playlist’s diverse event types. It maintains traction even on FH6’s more experimental tracks, allowing players to push full throttle early without losing control. This makes it ideal for both leaderboard chasers and casual speed enthusiasts. Whether you’re chasing 999 PI perfection or aiming for the smoothest possible lap times, the Koenigsegg Jesko remains the ultimate symbol of FH6’s X Class mastery—a car that defines the boundary between reality and Horizon legend.