2017-2023 L5P/L5D Stealth STR Turbo

Stealth STR Turbo for 2017–2023 6.6L L5P Duramax

Upgrade the stock turbo — don’t just replace it.
The Stealth STR is designed to deliver performance and reliability for your 2017–2019 Chevrolet or GMC 6.6L L5P Duramax. It combines OEM-fitment simplicity with serious internal upgrades, giving you more power, faster response, and long-term durability without the complexity of a full custom setup.

Why Choose the Stealth STR?

• Direct drop-in fitment for all 2017–2023 L5P Duramax trucks.

• Supports up to 625 rwhp while maintaining emissions compliance.

• Delivers an 80–100 rwhp gain over tune-only trucks, thanks to enhanced airflow and upgraded internals.

• Optimized for both box-tuner and custom-tune setups — or even stock ECU operation in many cases.