U4GM Reveals the Best New Engine Swaps in Forza Horizon 6

The latest update has brought significant changes to the competitive scene in Forza Horizon 6, giving several previously overlooked vehicles a new opportunity to shine. Update 6 introduces new engine swaps, expands customization options, and improves the performance potential of multiple cars. For players looking to build competitive vehicles without wasting resources, understanding these changes can make a real difference. Whether you are experimenting with Forza Horizon 6 Credits to develop new builds or searching for the strongest tuning combinations, this update offers plenty of exciting possibilities.

Mazda 787B: A Surprisingly Powerful New Build

One of the biggest highlights of Update 6 is the Mazda 787B. At first glance, its new engine swap appears to be a downgrade because it reduces the car's horsepower and performance rating. However, this lower rating creates opportunities to improve other aspects of the build, including all-wheel drive, tire selection, and forced induction.

The centrifugal supercharger is particularly important. It adds approximately 64 horsepower while increasing weight by only around 13 pounds. Surprisingly, the performance index can even decrease despite the additional power. This creates room for further upgrades and allows the 787B to become a formidable competitor in different racing classes.

With the right setup, the car delivers exceptional grip and stability. Its wide rear tires help it remain planted through high-speed corners, making it extremely competitive against conventional S1 and S2 vehicles. However, its handling characteristics will not appeal to everyone. The enormous grip can make the car feel less agile, particularly for drivers who prefer a responsive vehicle that can rotate quickly through tight corners.

Mazda Furai: A Stronger S2 Contender

The Mazda Furai receives similar treatment, although its potential is particularly interesting in the S2 class. By installing the V6 engine swap and adding a centrifugal supercharger, players can create a build with impressive performance and a competitive performance index.

Soft-compound slick tires further enhance its cornering ability, allowing the Furai to maintain high speeds through demanding sections of a track. Early testing suggests that this setup can outperform some previously dominant vehicles. Cars that once appeared unbeatable may now face serious competition from builds that were previously overlooked.

Nevertheless, it is too early to declare the Furai or 787B the undisputed king of their respective classes. Update 6 has only recently arrived, and competitive players are still experimenting with different combinations. The more important achievement is that several vehicles now have a realistic chance of competing at a high level.

Nissan GT-R and VQ Engine Swaps

Nissan enthusiasts also have reasons to celebrate. Update 6 introduces VQ engine swaps for several Nissan models, including the 370Z and GT-R, as well as selected Lexus vehicles. These changes can transform cars that previously struggled to compete in their classes.

The Nissan GT-R is a particularly interesting example. With an appropriate engine configuration, centrifugal supercharger, racing suspension, rally tires, and all-wheel drive, it becomes a much more capable racing machine. In one test, a tuned GT-R achieved a lap time of approximately 1:01.3, demonstrating its potential against established competitors such as the Chevrolet Camaro.

The GT-R may not immediately become the fastest option for every track, and its handling can feel less forgiving than some alternatives. However, its improved acceleration, braking performance, and cornering speed make it a far more appealing choice for competitive players.

Hidden Tire Upgrades Expand Customization

Beyond the officially announced engine swaps, Update 6 includes additional customization options that were not clearly highlighted in the patch notes. Certain high-performance road cars can now access alternative tire compounds, including semi-slicks and soft-compound tires.

Vehicles such as the Hennessey Venom, Ferrari SF90, and Lamborghini Centenario benefit from these expanded choices. Depending on the car, players may be able to select different semi-slick or racing tire configurations to improve grip.

There is one important limitation: these tires are not always efficient in terms of performance index. A tire upgrade may deliver better cornering performance but consume valuable PI points that could otherwise be spent on engine power, weight reduction, or other modifications. Players should therefore test different combinations instead of assuming that the softest compound is always the best option.

The Dodge Viper V10 Makes Unusual Cars Competitive

Another standout change involves the Dodge Viper's V10 engine. This powerful swap can dramatically increase horsepower while keeping the performance-index increase relatively manageable. Combining it with a centrifugal supercharger can provide approximately 100 additional horsepower for around 11 PI points in the showcased configuration.

The Jeep Gladiator demonstrates how effective this combination can be. Equipped with the V10, off-road tires, and all-wheel drive, the previously underwhelming vehicle becomes surprisingly competitive. Its substantial power and planted handling make it a more practical choice than its original performance might suggest.

This example captures the spirit of Update 6: rather than simply making already dominant vehicles stronger, the developers have created opportunities for unconventional builds to become viable.

Better Balance Matters More Than More Cars

The most important result of Update 6 is the increased variety of competitive vehicles. The Mazda 787B, Furai, Nissan GT-R, and Jeep Gladiator each demonstrate how thoughtful tuning can open new possibilities across different classes. No single vehicle has to dominate every situation for the update to succeed.

There is still room for improvement, especially in online matchmaking, ranked racing, and broader competitive modes. Better balance gives players more meaningful choices, but those choices become even more valuable when the game provides reliable ways to compete against drivers of similar skill levels.

Ultimately, Update 6 is a positive step toward a healthier racing environment. Players can explore new builds, experiment with hidden upgrades, and discover overlooked cars without automatically relying on the same established options. For anyone interested in FH6 Cars, mastering these engine swaps, tire combinations, and class-specific tuning strategies can help make the move into competitive racing more rewarding. The next major improvement should focus on stronger online systems and ranked competition, allowing the expanded vehicle variety to reach its full potential.