How to Upgrade the 2005 Ford GT in Forza Horizon 6

BluePulse

The 2005 Ford GT is already one of the best-balanced supercars in Forza Horizon 6, but once you start pushing it into S1 Class street racing, the stock setup begins to show a few weaknesses. The car has huge power, excellent straight-line speed, and strong mid-engine grip, but it can become unstable on tighter Japanese mountain roads if you upgrade it carelessly.

After spending time testing different builds, I found that the best approach is not simply adding maximum horsepower. The real goal is building a clean, controllable S1 setup that keeps the GT fast through corners without accidentally pushing it into S2 Class.

Start With the Conversions Tab

Before buying random upgrades, always check the Conversions section first. Your choices here affect everything else later.

For most players, keeping the AWD drivetrain is the safest and most effective option. AWD gives the Ford GT much stronger launches and makes the car easier to control on wet roads, technical city sections, and tight uphill routes. In Forza Horizon 6, especially on Japan-inspired roads with constant elevation changes, AWD helps the car stay predictable.

The stock supercharged V8 is already extremely strong, so there is no urgent need for an engine swap. In fact, the stock engine has very good PI efficiency because it delivers power high in the rev range. The game’s PI system often undervalues engines that keep pulling past redline, which means you can gain strong performance without wasting class points.

Focus on Handling Before Power

A common mistake is upgrading horsepower first. The Ford GT already has enough speed for S1 racing, so handling upgrades give much bigger lap-time improvements.

Start with Race Weight Reduction. This is probably the single best upgrade for the car because it improves acceleration, braking, and corner response all at once. The GT feels dramatically more agile after losing weight.

Next, install Race Springs and Dampers. This unlocks tuning adjustments that help stabilize the car on uneven roads and fast transitions. Japan’s roads in FH6 are full of elevation changes, so suspension tuning matters much more than raw speed.

Race Anti-Roll Bars are also important. They reduce body roll and make the GT feel sharper during quick direction changes. Without upgraded ARBs, the car can feel loose during aggressive corner entries.

Finally, add Race Brakes. The stock brakes are acceptable, but upgraded brakes help a lot during downhill sections and technical street circuits where late braking is critical.

Tire Choice Changes Everything

Tires completely transform the Ford GT.

For a serious S1 build, Semi-Slick or Slick tires are the best options. The car already has excellent natural balance thanks to its mid-engine layout, and stronger tire compounds allow you to fully use that grip.

Semi-Slicks are usually the sweet spot if you still want decent top speed and manageable PI usage. Slicks provide maximum grip, but they can consume too much PI depending on the rest of the build.

Also install a Race Differential immediately. This upgrade is mandatory for high-level tuning because it allows you to control power delivery during corner exits. Without a proper differential setup, the GT can slide unpredictably when accelerating out of tight bends.

Upgrade the Engine Carefully

This is where many builds go wrong.

The Ford GT does not need every engine part upgraded. If you blindly install everything, the car quickly jumps into S2 Class and becomes harder to use.

Instead, focus on the most PI-efficient upgrades first.

The Exhaust upgrade gives excellent horsepower gains for relatively low PI cost. The Fuel System is another strong choice, improving overall power without ruining balance. Camshaft upgrades also provide solid performance increases while keeping the build efficient.

Some upgrades are better left for later.

The Intercooler may sound attractive, but it adds unnecessary front-end weight and is not very efficient for S1 tuning. The Flywheel upgrade also gives poor value compared to other parts, so it is usually one of the last things worth considering.

A balanced S1 Ford GT is often faster overall than an overbuilt S2 version because it remains easier to control on technical roads.

Aero Upgrades Are Worth It

A lot of players avoid wings because they want maximum top speed, but in Forza Horizon 6, adjustable aero can actually make the Ford GT significantly faster on real circuits.

If the rear of the car feels unstable at high speed, install both Front and Rear Aero upgrades. Yes, you lose a little straight-line speed, but the increase in cornering stability is massive.

On mountain roads and fast highway curves, the added grip makes the car feel much safer and more consistent. You can attack corners harder without worrying about sudden oversteer.

For pure speed builds, you can skip aero. But for competitive street racing, adjustable downforce is usually the better option.