08-10 Ford 6.4L Powerstroke KC Fusion Stage 1 Low Pressure Turbo

The KC Fusion Stage 1 Low Pressure Turbo is a drop-in LP turbo upgrade for the 2008-2010 6.4L Power Stroke, built specifically for tow rigs, stock-injector trucks, and owners who want real performance without planning injector upgrades. No core return is required, an install kit is included, and no HP turbo upgrade is required to run this LP. It runs a 71mm billet compressor wheel, ported anti-surge compressor cover, a larger 4" inlet, and the largest upgraded 360 thrust bearing in this class - producing approximately 638 hp and 1,306 lb-ft on stock injectors in KC's own testing, outperforming a competitive 73mm LP option at the same injection timing.

KC Fusion Stage 1 vs Stage 2 LP - Which Is Right for Your Build?

The Stage 1 is KC's entry-level LP turbo and the correct choice for stock-injector builds targeting up to approximately 650 hp. It is designed for tow rigs and owners who want measurable performance without injector upgrades. The 71mm billet compressor wheel, 4" inlet, and upgraded 360 thrust bearing deliver a real improvement over the factory LP - and in KC's own dyno testing on stock injectors, the Stage 1 outperforms a competitor's 73mm LP by approximately 17 hp and 53 lb-ft at the same injection timing.

If your build is headed toward larger injectors or a power target past 650 hp, the KC Fusion Stage 2 LP Turbo is the correct turbo for that application. The Stage 1 is not a compromise for its intended use - it is specifically engineered for the stock-injector tow rig. No core return is required. If your build is stock-injector and your goal is towing and street performance up to 650 hp, this is the correct LP turbo to order.

KC Fusion Stage 1 LP Turbo - What Makes It Different

KC spent years testing and modifying LP turbo configurations for the 6.4L Power Stroke before releasing the Fusion line. The Stage 1 LP is the only turbo in this class that combines a 4" larger inlet, ported anti-surge compressor cover, and the largest upgraded 360 thrust bearing available at this tier.

• 71mm Billet Compressor Wheel: Stronger and more precise than cast alternatives for improved airflow and response on stock injectors.
• Stock-Size Turbine Wheel: Maintains appropriate spool character for a stock-injector tow rig - not over-turbined for this application.
• Larger 4" Inlet: Increased inlet diameter for improved airflow - requires a 4" intake air filter upgrade to install.
• Ported Anti-Surge Compressor Cover: Reduces surge tendency under load for reliable boost delivery while towing.
• Largest Upgraded 360 Thrust Bearing: KC's largest 360-degree thrust bearing design in this class for improved durability.

The combination of the billet wheel, ported anti-surge cover, and upgraded thrust bearing is not found in other LP turbos at this tier - it is what separates the Stage 1 from rebuilt or budget LP alternatives for the stock-injector tow rig application.

What Comes in the Box

The KC Fusion Stage 1 LP Turbo ships ready to install:

• KC Fusion Stage 1 Low Pressure Turbo (assembled, brand new)
• Install kit

No core return is required. A 4" inlet air filter upgrade must be sourced separately - it is required for installation and is not included with the turbo.

Avoid These Common Mistakes

• Not sourcing the 4" intake upgrade before install: The factory air filter will not fit the larger 4" inlet. Source the 4" intake upgrade before the turbo arrives - it is a required part of the installation.
• Ordering Stage 1 for a build with larger injectors planned: This turbo is sized and designed for stock injectors. If you are planning injector upgrades, order the Stage 2 LP Turbo now rather than upgrading again later.
• Assuming the HP turbo needs upgrading too: The Stage 1 LP does not require an HP turbo upgrade. It is designed to run with the factory HP turbo on your 6.4L Power Stroke.
• Shipping to CA or CO: Confirm your delivery address is outside California and Colorado before placing the order.

2008-2010 6.4L Power Stroke Fitment

The KC Fusion Stage 1 LP Turbo is a drop-in fit for 2008-2010 6.4L Power Stroke applications (Ford F-250, F-350, F-450 Super Duty). The only required change for installation is upgrading to a 4" inlet air filter. No HP turbo modification is required.

Before You Order - Final Check

• Engine confirmed as 2008-2010 6.4L Power Stroke
• Power goal is up to approximately 650 hp on stock injectors
• 4" inlet air filter upgrade sourced or confirmed - required for installation
• Delivery address confirmed outside CA and CO

For a 2008-2010 6.4L Power Stroke stock-injector tow rig targeting up to 650 hp, the KC Fusion Stage 1 LP Turbo is the correct drop-in LP upgrade - no core, no HP turbo change, just a 4" intake swap and a stronger low-pressure turbo.

Read KC's multi-year testing and development thread for the Fusion LP turbo on PowerStrokeArmy: KC Turbos 6.4 Turbo Testing Thread.