Duramax Tuner L5P / L5D Stealth Mach 2 (67) Turbo (2017-2019)

L5P / L5D Stealth 67G2 Turbocharger

The Stealth 67G2 turbo is engineered for 2017–2019 GM 6.6L Duramax L5P/L5D trucks and 2019+ International CV (Medium Duty) models. Designed for enthusiasts seeking maximum performance without sacrificing drivability, it delivers airflow for up to 800 HP while maintaining quick spool and reliable street manners.

Performance Highlights

Supports up to 650 RWHP on stock emissions and basic supporting mods

Competition-tested to achieve 800+ RWHP with extensive supporting upgrades

Custom HFV (High Flow Vane) technology for superior high-load efficiency

HFV (High Flow Vane) Technology

Proprietary vane and nozzle ring assembly produced in-house

Taller, wider vanes matched to the larger turbine optimize response and efficiency

Retains factory exhaust brake function for daily drivability

Custom Billet Compressor Wheel

67mm, 11-blade billet design

Lightweight yet strong for fast spool-up

Wide efficiency range with 81 lbs/min airflow (stock: 60 lbs/min)

Beast Turbine Wheel

Oversized 9-blade, high-flow turbine

Reduces drive pressure under high load

Captures exhaust energy more efficiently, lowering EGTs at peak power

Tuned for quick spool to support up to 700 HP

Produces the distinctive Stealth turbo whistle

Built for Real-World Use

100% new parts and electronics — no core charge required

Designed for use with custom tuning

Ideal for daily driving, towing, or maximum power applications

Actuator Information

Does not include a new actuator

Factory L5P/L5D actuators are highly reliable and well-cooled

Unless experiencing confirmed issues, retaining your factory actuator is recommended

Optional Upgrade – Stealth Boost Tester

Ensures your entire charged air system is leak-free

Helps maintain peak performance, fuel efficiency, and engine longevity

Features heavy-duty regulator, liquid gauge, CNC-cut adapter, and premium materials

Made and assembled in the USA

Important Notice

Must be used with tuning that maintains stock minimum and maximum vane position tables

Altering vane positions can cause excessive boost or exhaust pressure, reducing turbo and engine life and voiding warranty

Warranty

1-year unlimited mileage manufacturer warranty covering materials and craftsmanship

Vehicle Fitment

2017–2019 Chevy Silverado & GMC Sierra 2500, 3500, 4500, 5500, 6500

2019+ International CV (Medium Duty)

Replaces OEM part numbers: 12709701044, 11547786, 12683985, 12689094