Product description
Duramax Tuner L5P / L5D Stealth STR Turbo (2020-2023)
Unleash more power, reliability, and response without compromising emissions compliance.
The Stealth STR is a direct replacement turbo built for 2020–2023 Chevy Silverado and GMC Sierra 2500/3500 models equipped with the L5P or L5D Duramax engine. Whether you’re towing heavy, chasing horsepower, or just replacing a worn turbo, the Stealth STR is the ultimate performance-minded upgrade that retains factory fitment and emissions components.
Key Performance Benefits:
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Supports up to 625 RWHP with emissions equipment intact
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Gain up to +50HP with no tuning required
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Works seamlessly with box tuners, custom tuning, or stock calibrations
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Reduces average EGTs and improves thermal control
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Faster spool-up and enhanced throttle response
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Whistle-enhanced turbine sound from precision 9-blade design
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Zero compressor surge, even under towing load
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All-new construction—no core charges or reman components
Premium Features
63mm Velocity-Forged Compressor Wheel
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Custom 7-blade billet aluminum design for superior airflow
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Optimized for fast spool-up and reduced rotational mass
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Super Back design reduces weight and increases durability
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Engineered for peak boost pressures over 40+ PSI
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Designed for high-efficiency airflow across the powerband
65mm High-Flow Turbine Wheel
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Upgraded from stock 62.5mm to 65mm exducer
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9-blade configuration promotes smoother exhaust flow
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Improves boost-to-drive pressure ratios under load
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Enhanced durability under extreme EGT conditions
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Classic whistle with performance tone
Lightweight Rotating Assembly
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6% lighter than stock for improved response
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Balanced in-house to exacting standards
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Reduces drive pressure and increases efficiency
High-Flow Ported Exhaust Housing
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Enlarged outlet matched to upgraded turbine
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Reduces post-turbine restriction and back pressure
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Supports better exhaust scavenging and cooler EGTs
Why Choose the Stealth STR?
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No Core Required – 100% brand new, no rebuild or exchange
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Ready to Run – Works with or without tuning
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Built to Perform – Perfect for daily driving, towing, or high-power builds
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Warranty Included – 1-Year Unlimited Mile Manufacturer’s Warranty
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U.S.-Based Support – Real experts, real service, based in the USA
Perfect Fit For:
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Trucks aiming for up to 625 RWHP
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Daily drivers and heavy haulers who want better throttle response
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L5P/L5D owners with box or custom tunes
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Drivers looking for a reliable stock replacement with more muscle
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Completely stock trucks needing a direct-fit upgrade
Actuator Info:
Actuator not included.
Most 2017–2023 6.6L Duramax actuators are highly reliable and well-shielded from heat. Unless your vehicle is showing actuator-related codes or confirmed failure, reusing the original actuator is a smart and economical choice.
Add-On: STR Boost Leak Tester
Keep your charge system sealed and performing at its best.
Boost leaks rob your engine of power, efficiency, and longevity. The STR Boost Tester is precision-built for full system pressure testing.
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CNC-cut adapter for perfect fitment
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Heavy-duty regulator with accurate, liquid-filled gauge
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Rugged metal construction with high-quality seals
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Easy to use and designed to last a lifetime
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Designed, made, and assembled in the USA