FH6 Best Engine Swaps Guide: Transform Your Car with These Powertrain Upgrades

Published: May 20, 2026 · 7 min read

How Engine Swaps Work in FH6

Engine swaps in Forza Horizon 6 allow you to replace your car's stock powertrain with a more powerful or specialized engine. Access swaps from your garage or the auto show by selecting a car and navigating to the "Engine Swaps" tab in the upgrades menu. Costs range from 15,000 credits (CR) for basic swaps to over 300,000 CR for high-end racing engines. To unlock discounts, spend skill points in the "Car Mastery" tree—each car has specific perks that reduce swap costs by up to 50%. Always check the donor car’s availability; some swaps require owning the donor vehicle or completing specific barn finds.

Top 10 Most Powerful Engine Swaps

• V12 Lamborghini into BMW M3 (E46) – 1,200 HP, PI class jumps from B to S1. Perfect for grip builds.
• 7.2L Racing V8 into Nissan 240SX – 1,100 HP, PI class A to S2. Ideal for drift and street racing.
• 6.5L V12 into Toyota Supra – 1,350 HP, PI class A to S2. Dominates drag and circuit.
• Racing V10 into Ford Mustang GT – 1,050 HP, PI class B to S1. Balanced for road racing.
• 4.0L Flat-6 into Mazda RX-7 – 950 HP, PI class A to S1. Lightweight and responsive.
• V8 Twin-Turbo into Chevrolet Camaro – 1,100 HP, PI class B to S2. High torque for acceleration.
• 3.8L V6 into Subaru WRX STI – 850 HP, PI class A to S1. Excellent for all-wheel drive builds.
• Racing V12 into Ferrari 458 – 1,400 HP, PI class S1 to X. Ultimate track weapon.
• V8 Supercharger into Dodge Challenger – 1,200 HP, PI class B to S2. Muscle car power.
• Electric Motor into Volkswagen Beetle – 800 HP, PI class C to A. Unique and instant torque.

Best Budget Engine Swaps Under 100K Credits

For early game players, focus on swaps that cost less than 100,000 CR. The 6.2L V8 into the Ford F-150 (45,000 CR) adds 700 HP for off-road events. Swap the 3.0L I6 Turbo into the Nissan Silvia (60,000 CR) for a drift-friendly 650 HP. The 5.7L V8 into the Chevrolet Bel Air (80,000 CR) gives classic muscle a modern edge. Use skill points to reduce these costs further—check car mastery for "Discount on Engine Swaps" perks.

Drag Racing Engine Swaps

For drag strip dominance, prioritize horsepower and torque. The 7.2L Racing V8 in the Nissan 240SX produces 1,100 HP with quick spool. The 6.5L V12 in the Toyota Supra hits 1,350 HP, ideal for top speed runs. The V12 Lamborghini into the BMW M3 delivers 1,200 HP with excellent traction. Pair these with drag tires and a fully upgraded transmission for sub-8-second quarter-mile times.

Off-Road and Rally Engine Swaps

Torque is king for dirt and cross country. Swap the 6.2L V8 into the Ford Bronco for 800 HP and massive low-end torque. The 4.0L Flat-6 into the Subaru WRX STI provides 850 HP with all-wheel drive compatibility. For lightweight rally, use the 3.8L V6 in the Mitsubishi Lancer Evo (750 HP). These swaps improve acceleration out of corners and over rough terrain.

Drift Engine Swaps

Smooth power delivery is essential for drift angle control. The 7.2L Racing V8 in the Nissan 240SX offers linear torque for sustained slides. Swap the 4.0L Flat-6 into the Mazda RX-7 for a responsive 950 HP. The V8 Twin-Turbo into the Chevrolet Camaro provides 1,100 HP with adjustable boost. Always pair with drift suspension and angle kits for maximum control.

Engine Swap vs Full Upgrade: When to Choose What

Engine swaps are best for transforming a car’s character—turning a slow cruiser into a race monster. They cost more but offer massive PI gains. Full upgrades (intake, exhaust, camshaft, etc.) are cheaper and allow fine-tuning but cap at lower power. Choose swaps for endgame builds or niche events (drag, drift). Use full upgrades for daily drivers or when you want to stay in a specific PI class. Pros of swaps: huge power, unique sound. Cons: high cost, PI class jumps.

Hidden Gems: Unexpected Engine Swap Combos

Few players know these surprisingly effective combos. Swap the 3.0L I6 Turbo from the BMW M3 into the Mini Cooper S for a 600 HP pocket rocket (PI class D to B). The 5.2L V10 into the Ford Mustang GT (1,000 HP) creates a muscle car that handles like a supercar. The Electric Motor into the Volkswagen Bus (500 HP) gives instant torque for off-road fun. These combos are cheap (under 120,000 CR) and offer unique driving experiences.