17-23 GM L5P 6.6L Duramax Calibrated Power Stealth STR Turbo

2017-2023 L5P Duramax Stealth STR Drop In VGT Turbo

If you want more than a basic stock replacement turbo for your L5P, the Stealth STR is built for that exact buyer. It keeps true drop-in fitment, stock-style drivability, and VGT functionality while adding airflow, stronger component materials, a lighter rotating assembly, and the ability to support up to 625 RWHP with stock emissions still in place.

This is a strong choice for trucks that tow, daily drive, run a box tuner or custom tuning, or simply need a more capable turbo without jumping into a complicated race-only setup. It also works on completely stock trucks and does not require tuning to run, provided the truck is otherwise operating correctly and the tuning warning below is respected.

Why L5P Owners Move To The Stealth STR

The Stealth STR is not just a replacement for a failed stock charger. It is built for L5P owners who want more usable airflow, stronger response, and a more durable rotating assembly without giving up the simplicity of a direct drop-in turbo.

• Proven to support up to 625 RWHP with stock emissions.
• Can add roughly 80 to 100 RWHP over a tune-only L5P setup.
• Works well with box tuners, custom tuning, or no tuning at all.
• Provides lower average EGTs and better EGT control.
• Uses more durable upgraded components than stock.
• Delivers fast spool-up and immediate throttle response.
• Produces a louder turbo whistle from the 9-blade turbine design.
• Designed to stay surge-free even under heavy towing loads.

Next step: If your goal is a stronger all-around L5P turbo instead of a plain stock replacement, this turbo makes sense.

Compressor, Turbine, and Rotating Assembly Details

This charger combines a larger billet compressor wheel, a higher-flow turbine wheel, and a lighter rotating assembly to improve airflow, transient response, and durability.

• Compressor wheel: 62.5mm 7+7 blade extended tip billet 2618 aluminum alloy wheel.
• Compressor design: Higher airflow than stock with sizing aimed at strong efficiency and quick response.
• Peak boost capability: 40+ PSI.
• Turbine wheel: 65mm 9-blade 713C nickel alloy turbine wheel.
• Stock comparison: 65mm exducer versus 62.5mm stock.
• Rotating assembly: 6% lighter than stock.
• Balance: Precision balanced in-house.
• Housing: Ported exhaust housing with a larger exhaust port opening to match the larger turbine.

The result is a turbo that comes up fast, carries airflow better under load, and helps reduce backpressure compared to the stock unit.

What To Verify Before Ordering

Fitment is only part of the decision. You also want to verify that the truck, tuning, and actuator situation all line up with how this turbo is meant to be used.

• This is for 2017-2023 L5P Duramax applications.
• It is a drop-in VGT turbo, not a custom single turbo conversion.
• It can be used on stock trucks and does not require tuning to run.
• If tuned, vane control must stay on stock Minimum and Maximum Vane Position tables.
• If your current issue points to actuator failure, diagnose that separately before deciding whether to add an actuator.

Next step: Once fitment and tuning strategy are confirmed, you can move forward with confidence.

Do You Need An Actuator With This Turbo?

Not always. According to the provided source material, the L5P actuator has a very low failure rate in the field. Because it is well cooled and not positioned close to the hottest parts of the turbo, it is usually out of harm's way compared to actuators on other applications.

If you are not seeing fault codes that point to actuator problems and you do not know of actual actuator damage, the smarter move is usually to keep your factory actuator and save the extra money. Buy a new actuator only when you have confirmed that your original one is bad or physically damaged.

Next step: Diagnose actuator-related codes before spending more than you need to.

Important Tuning Warning For Turbo Life And Warranty

This turbo must only be operated with tuning that uses stock Minimum and Maximum Vane Position tables. That warning is not minor. It directly affects exhaust pressure, boost control, turbo life, engine life, and warranty exposure.

When vane position tables are altered away from stock, the turbo can be forced into operating conditions that create excessive exhaust pressure and boost. That can shorten the life of the charger, place more stress on the engine, and shift responsibility for the damage to the owner rather than Calibrated Power Solutions Inc.

What happens if ignored: Excessive exhaust pressure and boost can shorten turbo life, increase engine stress, and create a warranty problem that lands on the owner instead of the manufacturer.

Next step: If your truck has custom tuning, verify vane table strategy before installation and before putting the turbo under load.

Direct Replacement And Superseded Part Numbers

This turbo supersedes the following part numbers:

It also replaces the following GM part numbers:

What You Get With The Stealth STR

• Brand new parts and accessories.
• No core charge.
• Brand new actuators available.
• 1-year warranty on all turbos.
• Extended warranties available.
• Live on-site customer support team.

If your truck matches the 2017-2023 L5P fitment, your power goal stays within the supported range, and your tuning keeps stock vane position tables in place, this is the correct drop-in turbo to order. If any of those points are still uncertain, verify them before installation so the new turbo gets the operating conditions it was designed for.

Stealth STR L5P Duramax Video Overview

2017-2023 L5P Duramax Stealth STR Turbo Questions