KC300x Stage 2 L99

Gen 3

Supports: Up to 238cc/80% injectors

Features & Details:  

• 100% Drop In Turbo (no modifications required)
• Dyno Proven Power Gains
• Redesigned Gen 3 7x7 SXE style compressor wheel with upgraded aero
• Thick Shaft Gen 3 SXE style turbine wheel
• Redesigned quick spool 0.70AR Ported Compressor Cover
• Improved MAP Groove, Anti-Surge Ring, and Volute Shape
• Redesigned 0.91AR Turbine Housing with upgraded volute technology for Quicker Spool & More Top End Power
• Spools FASTER than the old 0.84AR and flows MORE air than the old 1.0AR due to this radical redesign
• 200% Larger Thrust and Journal Bearings
• Thicker turbine shaft to accommodate larger bearings and  higher boost and HP levels.  Stock shaft sizes can deflect and result in catastrophic failures
• Redesigned Bearing Housing with integrated cast iron backing plate for improved high speed stability by reducing deflection 
• Added Steel Thrust Insert to Reinforce oil slinger and piston seal Contact Areas & Eliminate Bearing Fatigue
• High Flow Non-EBPV outlet flange
• Redesigned Round-Top Wastegate Actuator for increased boost control
• Comes with all gaskets and o-rings to install
• Comes with newly upgraded 4" intake boot with better fitment over previous designs
• Powder Coating can take up to 3 weeks before it ships

Description:  

Upgrade your 7.3 Powerstroke with the KC300x Stage 1 Gen 3 Turbo, a drop-in performance turbo designed for quicker spool-up, increased airflow, and more power. This turbo features a 4” ported housing with drilled anti-surge for improved efficiency, a completely redesigned Gen 3 7x7 SXE-style compressor wheel with extended tip technology for faster response, and an SXE-style turbine wheel with a thicker shaft for increased durability.

We’ve re-engineered both the compressor and turbine housings to bring modern turbo technology to the 7.3 Powerstroke platform. The .91 A/R turbine housing and .70 A/R compressor cover optimize airflow for faster spool and more top-end power, outperforming outdated stock options. These upgrades are inspired by the latest turbocharger designs, incorporating improved volute shaping, optimized flow paths, and enhanced material density for superior performance.

Durability is just as important as power, which is why the KC300x Gen 3 features a redesigned bearing housing and backing plate to accommodate 200% larger thrust bearings and wider, taller journal bearings. The steel thrust insert replaces the weaker aluminum backing plate, reducing expansion rates and ensuring consistent performance under extreme heat and pressure. These reinforcements enhance turbo longevity, preventing distortion and deflection in high-horsepower applications.

After years of research and development, we’ve created the most powerful drop-in turbo available—guaranteed to outperform anything else on the market. This turbo is an ideal match for stock injectors up to 205/30s, but if you’re running anything larger, we recommend checking out the KC300x G3 Stage 2 for maximum performance.

Curious about the exact sizing? We guarantee this turbo will outperform any other drop-in option, but if you really need the details, message us and we’ll go over the sizing options with you!

This turbo is engineered to maximize performance for the 7.3 Powerstroke. For smaller injectors, the KC300x G2 Stage 1 is the recommended option. This turbo is best suited for 205/30 to 238/80 injectors, though it can still operate with smaller sizes. However, for 205/30 and smaller injectors, the Stage 1 turbo is the preferred choice for optimal efficiency and performance.

EXHAUST BRAKES:  We get asked a lot about exhaust brakes and if they work with our turbos.  We have found that some brands have clearance issues and might cause the brake to hinder performance, rub the turbine wheel, or cause other issues.  These brakes typically use some sort of flapper to close which causes extreme exhaust back pressure to aide in braking.  This can be hard on a turbo and motor and is not recommended.  It will be up to the customer to verify fitment and functionality.

These turbos come with a sand finish, unless ordered differently.  Polished and powder coat turbos covers are an additional $250 and a two week lead time. 

KC turbos are designed to fit in 7.3 diesel pick-up trucks.  The turbos can drop into 7.3 equipped Vans however, you will need to modify the turbo intake boot and down-pipe for proper fitment.  This turbocharger will not fit OBS or E99 trucks without modification.

We cannot guarantee fitment with all variations of aftermarket parts like fuel systems, plenums, piping kits, etc.