Duramax Tuner L5P / L5D Stealth STR Turbo (2024-2025)

L5P / L5D Stealth STR Turbo (2024–2025)
Don’t just replace your turbo—upgrade it.

If you’re driving a 2024–2025 6.6L Duramax, you know that a stock turbo replacement is costly. That’s why we built the Stealth STR—a direct-fit drop-in turbo that delivers better performance, reliability, and drivability while staying close to the cost of OEM.

Unlike other so-called “drop-ins” that require extensive tuning, the STR is designed to work right out of the box. No endless tune revisions. No complicated setup. Just bolt it in, enjoy the gains, and get back on the road.

Key Performance Gains

Supports up to 625 HP with supporting mods

+50 HP increase possible with no tuning required

Proven to perform with stock emissions intact

Lightning-fast spool-up and immediate throttle response

Distinctive 9-blade turbo whistle

Lower drive pressure & EGTs under heavy load

Brand-new build — no core charges

Engineered for Power & Reliability

63mm Billet Compressor Wheel

Extended-tip 7x7 blade design

66 lbs/min airflow (vs. 60 lbs/min stock)

Stronger and lighter than cast stock wheels

Wide efficiency range and faster response

Custom 9-Blade Turbine Wheel

Larger than stock with aggressive blade angle

50% thicker blades for greater heat tolerance

Improved exhaust energy capture

Reduced EGTs and backpressure

Produces the signature Stealth whistle

Precision-Balanced Rotating Assembly

6% lighter than stock for quicker spool

Boosts efficiency and reduces strain

Balanced in-house for smooth performance

Ported Exhaust Housing

Larger outlet for better post-turbine flow

Reduces back pressure for cleaner power delivery

Built For Your Truck If You…

Need a reliable stock replacement turbo for your 2024+ L5P Duramax

Tow heavy and want lower temps and zero surge

Drive your truck daily and want better throttle response

Plan to keep emissions intact but still want more power

Prefer a direct-fit solution with OEM-like install

Optional Add-On: Stealth Boost Tester

Boost leaks rob power, increase EGTs, and hurt fuel economy. The Stealth Boost Tester lets you quickly test your entire charge air system—from turbo to intake—for leaks. Built from premium CNC-cut parts, it’s durable, accurate, and easy to use.

Important Notice

This turbo must be used with tuning that retains stock minimum and maximum vane position tables. Non-stock vane position tuning can lead to excessive pressure and may void the warranty.

Warranty

All Stealth Series turbos include a 1-year unlimited mile manufacturer warranty for quality and craftsmanship.

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