Duramax Tuner L5P / L5D Stealth Mach 2 (67mm) Turbo (2024-2025)

L5P / L5D Stealth Mach 2 Turbo (2024–2025)
The Ultimate Drop-In Performance Turbo

For 2024–2025 6.6L Duramax owners chasing maximum power, the Stealth Mach 2 delivers. Designed as the top-tier drop-in upgrade, this turbo supports up to 750 HP worth of airflow while retaining exceptional drivability and reliability. Whether you’re towing, daily driving, or competing, the Mach 2 combines cutting-edge turbo technology with one of the easiest tuning experiences on the market.

No endless tune revisions. No complex trial and error. The Mach 2 comes with clear, dialed-in tuning guidance to help you and your tuner unleash its full potential quickly and effectively.

Key Performance Gains

Supports up to 750 HP airflow

625 RWHP achievable with stock emissions and basic mods

Proven in competition builds pushing 750+ RWHP

Faster spool-up than stock despite larger turbine

Distinctive Stealth turbo whistle

Lower drive pressure & EGTs at high load

All-new build with electronics — no core required

Engineered for All-Out Power

67mm Billet Compressor Wheel

Extended-tip 11-blade billet design

Wide efficiency range and reduced surge

Lightweight, high-strength billet construction

81 lbs/min airflow vs. 60 lbs/min stock

Custom 9-Blade Turbine Wheel

Larger with aggressive blade angle for maximum flow

50% thicker blades for greater heat resistance

Optimized for 750 HP capability

Captures exhaust energy for improved high-RPM EGTs

Delivers the Stealth whistle

Custom Vane Cage

Engineered to house the larger turbine wheel

Improves fitment and durability

Lightweight Rotating Assembly

Snappy spool comparable to stock

Precision balanced in-house

Smooth, efficient, and reliable

Built For Your Truck If You…

Want maximum power without sacrificing street performance

Need a turbo that’s easy to tune and quick to dial in

Prioritize reliability while running bigger fueling mods

Plan to daily drive, tow, and still dominate at the track

Optional Add-On: Stealth Boost Tester

Prevent hidden boost leaks that kill power, raise EGTs, and waste fuel. The Stealth Boost Tester is built from premium CNC-machined parts with a heavy-duty regulator and high-quality seals. Easy to use, precise, and durable—this tool ensures your charge air system is leak-free and performing at its best.

Important Notice

The Stealth Mach 2 must be paired with tuning that retains stock minimum and maximum vane position tables. Non-stock vane position tuning may cause excessive pressures, shorten turbo or engine life, and void warranty coverage.

Warranty

Every Stealth Series turbo comes with a 1-year unlimited mile manufacturer warranty covering quality and craftsmanship.

? Designed for 2024–2025 Chevy Silverado & GMC Sierra 2500/3500/4500/5500/6500 as well as 2024+ International CV Medium Duty models.
Direct OEM replacement for part numbers: 12709701044, 11547786, 12683985, 12689094.