KC300x G3 Stage 2 Turbo - 7.3 Powerstroke (L99-03)

KC300x Stage 2 Turbo – Gen 3 (L99 / 7.3 Powerstroke)

Injector Support

Supports up to 238cc / 80% injectors

Overview

The KC300x Stage 2 Gen 3 Turbo is the ultimate 100% drop-in turbo upgrade for the 7.3 Powerstroke platform. After years of in-house R&D, this turbo delivers faster spool, increased airflow, and superior reliability compared to previous generations and competing drop-in turbos on the market.

Designed for high horsepower applications while maintaining excellent street manners, the KC300x Gen 3 eliminates known weak points of the factory turbo and earlier KC designs—making it the most advanced drop-in option available.

Key Features & Benefits

• 100% Drop-In Turbo – No modifications required

• Dyno-Proven Power Gains

• Gen 3 Redesigned 7x7 SXE-Style Compressor Wheel

  • Extended tip technology

  • Upgraded aerodynamics for faster spool

• Thick-Shaft SXE-Style Turbine Wheel

  • Designed to handle higher boost and horsepower

• 0.70 A/R Ported Compressor Cover

  • Redesigned map groove, anti-surge ring, and volute shape

  • Improved airflow and surge resistance

• 0.91 A/R Redesigned Turbine Housing

  • Modern flow path and upgraded volute technology

  • Faster spool than the old 0.84 A/R

  • Flows more air than the old 1.0 A/R

• Spools Faster & Makes More Top-End Power than previous KC options

• 200% Larger Thrust Bearings

• Upgraded Journal Bearings

  • Wider and taller for improved load capacity

• Thicker Turbine Shaft

  • Prevents shaft deflection and catastrophic failures seen in stock designs

• Redesigned Bearing Housing

  • Integrated cast-iron backing plate for high-speed stability

• Steel Thrust Insert

  • Reinforces oil slinger and piston seal contact areas

  • Eliminates bearing fatigue and improves longevity

• High-Flow Non-EBPV Outlet Flange

• Round-Top Wastegate Actuator

  • Improved boost control

• Includes All Required Gaskets & O-Rings

• Includes Upgraded 4” Intake Boot

  • Improved fitment over previous designs

Performance Design Details

The Gen 3 KC300x utilizes a 0.91 A/R turbine housing and 0.70 A/R compressor cover, replacing older, inefficient housing designs. Drawing inspiration from modern turbocharger technology, the flow path, volute shape, and material density were completely re-engineered.

Compared to the previous 0.84 and 1.0 A/R turbine housings, the new 0.91 A/R:

• Spools quicker

• Produces more usable top-end power

• Maintains excellent drive pressure control

The redesigned bearing housing allows for 200% larger thrust bearings and significantly upgraded journal bearings, dramatically improving reliability at elevated boost and horsepower levels.

Injector & Turbo Sizing Guidance

This turbo is recommended for 205/30 up to 238/80 injectors.

• Will operate on smaller injectors, but for 205/30 and smaller, we recommend the KC300x Gen 3 Stage 1.

• Exact compressor sizing is proprietary, but rest assured:
  This turbo will outperform any other drop-in turbo on the market — guaranteed.

If you need specific sizing details, feel free to contact us and we’ll walk you through the best setup for your truck.

Fitment Information

• Designed for 7.3 Powerstroke pickup trucks

• Fits 7.3 vans with modification to:

  • Turbo intake boot

  • Downpipe

• Will NOT fit OBS or E99 trucks without modification

• Fitment with aftermarket fuel systems, plenums, or piping kits cannot be guaranteed

Optional Add-Ons & Recommendations

For best performance, we highly recommend:

• Upgraded Up-Pipes

• Upgraded EBPV Pedestal

• Hydra Programming Chip

Exhaust Brake Notice

Some exhaust brakes may cause clearance or performance issues due to flapper-style designs that create excessive back pressure. Fitment and compatibility are the responsibility of the customer.

Finish Options & Lead Times

• Turbos are sand cast by default

• Optional polished compressor cover available for $250

  • 2-week lead time for polished covers

• Powder coating may take up to 3 weeks before shipping

Looking for a Smaller Setup?

If you’re running smaller injectors and want maximum efficiency, check out the KC300x Gen 3 Stage 1 Turbo.