Garrett 886976-5004S PowerMax GT3788V Stage1 Turbocharger for 2011-2016 C

Vehicle Fitment

• 2011-2016 Chevrolet Silverado 2500HD/3500HD (6.6L Duramax LML Diesel)
• 2011-2016 GMC Sierra 2500HD/3500HD (6.6L Duramax LML Diesel)

Features

• Garrett PowerMax™ Stage 1 performance turbocharger upgrade
• Direct drop-in replacement for stock LML turbocharger
• 65 mm forged, fully machined compressor wheel for increased flow
• GT3788V variable geometry turbo design for strong performance
• Approximately 19% more airflow than OEM turbocharger
• Supports increased horsepower potential up to ~600 RWHP
• Maintains OEM installation specification and mounting points
• Precision engineered for improved durability and efficiency

Specifications

• Brand: Garrett Motion
• Part Number: 886976-5004S
• Turbo Model: PowerMax GT3788V Stage 1
• Compressor Inducer: ~65 mm
• Flow Increase: ~19% over stock
• Estimated Power Support: Up to ~600 RWHP
• Turbo Type: Variable geometry diesel performance turbo
• Fitment: Direct OEM replacement

Included Components

• 1x Garrett PowerMax GT3788V Stage 1 turbocharger (886976-5004S)
• 1x Vane position sensor

Product Description

The Garrett 886976-5004S PowerMax GT3788V Stage 1 Turbocharger is a performance upgrade designed specifically for 2011-2016 Chevrolet and GMC 2500HD/3500HD trucks equipped with the 6.6L Duramax LML diesel engine. As a direct "drop-in" replacement for the OEM turbo, this Garrett PowerMax™ unit uses a lightweight, forged, and fully machined compressor wheel with optimized aerodynamics to deliver approximately **19 % more airflow than the stock turbocharger**, helping support enhanced power potential while maintaining factory installation points. :contentReference[oaicite:0]{index=0}

Built around the robust **GT3788V variable geometry platform**, the 886976-5004S turbocharger is capable of supporting up to **~600 RWHP** when paired with proper tuning and supporting modifications. Its design ensures improved performance and increased airflow without sacrificing reliability, making it a great choice for Duramax owners who want more power and torque for towing, hauling, or performance diesel builds. The turbo keeps the same mounting and hardware specifications as the original unit, allowing for a smoother installation with minimal fabrication.

This PowerMax™ performance turbocharger is engineered for drivers who want a balance of durability and elevated performance while staying compatible with their truck's factory systems. While not a race-only unit, the 886976-5004S provides a noticeable boost in airflow and power capability, making it a popular upgrade for heavy-duty Duramax builds seeking more horsepower and torque without sacrificing street-ready usability.