• Garrett PowerMax GT3788V Turbocharger Kit - 6.6L Duramax LML | 2011-2014 GMC Sierra 2500 - Stateside Performance - Turbochargers - Garrett - Garrett PowerMax GT3788V Turbocharger Kit - 6.6L Duramax LML | 2011-2014 GMC Sierra 2500
  • Garrett PowerMax GT3788V Turbocharger Kit - 6.6L Duramax LML | 2011-2014 GMC Sierra 2500 - Stateside Performance - Turbochargers - Garrett - Garrett PowerMax GT3788V Turbocharger Kit - 6.6L Duramax LML | 2011-2014 GMC Sierra 2500
  • Garrett PowerMax GT3788V Turbocharger Kit - 6.6L Duramax LML | 2011-2014 GMC Sierra 2500 - Stateside Performance - Turbochargers - Garrett - Garrett PowerMax GT3788V Turbocharger Kit - 6.6L Duramax LML | 2011-2014 GMC Sierra 2500
  • Garrett PowerMax GT3788V Turbocharger Kit - 6.6L Duramax LML | 2011-2014 GMC Sierra 2500 - Stateside Performance - Turbochargers - Garrett - Garrett PowerMax GT3788V Turbocharger Kit - 6.6L Duramax LML | 2011-2014 GMC Sierra 2500
1 4

GRT886976-5004S

Garrett

Garrett PowerMax GT3788V Turbocharger Kit - 6.6L Duramax LML | 2011-2014 GMC Sierra 2500

Garrett PowerMax GT3788V Turbocharger Kit - 6.6L Duramax LML | 2011-2014 GMC Sierra 2500

$3,069.81 USD
$3,069.81 USD
Sale Sold out
Shipping calculated at checkout.

The Garrett PowerMax GT3788V Turbo Kit fits the 2011-2014 GMC Sierra 2500 6.6L Duramax LML and delivers a direct bolt-on turbo upgrade for more airflow and boost.

Install Difficulty: Professional Install Only
Turbocharger replacement on the LML Duramax requires exhaust and intake disassembly, oil and coolant line service, and typically takes 6-8 hours on a vehicle lift. Professional ECU tune recommended after installation to safely manage the increased airflow and boost.

Product Overview

This drop-in turbocharger replaces the factory LML Duramax unit with a Garrett PowerMax GT3788V, engineered for higher flow and quicker spool.

The upgraded compressor and turbine wheels support meaningful power gains while retaining stock mounting locations, oil feed, and coolant lines.

Ideal for LML owners chasing more towing muscle or the headroom to run a performance tune safely.

Features & Specifications

  • Fits: 2011-2014 GMC Sierra 2500
  • Fits 6.6L Duramax LML diesel only
  • Direct bolt-on replacement for factory LML turbo
  • Garrett PowerMax GT3788V variable geometry turbocharger
  • Upgraded compressor and turbine wheels for more airflow
  • Retains factory oil, coolant, and mounting locations
  • Supports higher boost for towing and performance builds
  • Professional tune recommended -- this forced-induction component changes airflow and boost, so proper ECU calibration is recommended to safely realize its performance and avoid lean or over-boost conditions.

Fitment

This part fits the following vehicles:

Year Make Model Submodel
2011-2014 GMC Sierra 2500 All
⚠ Submodel Fitment: If your submodel is not listed in the fitment table above, we cannot confirm fitment. Please contact us before purchasing to verify.

Shipping & Returns

Tracking is typically provided within 3–5 business days; items shipping direct from the manufacturer may take 5–7. Some items are made to order or may be backordered. Questions about stock? Reach us through live chat or email.

Warranty

All warranties are through the manufacturer and are facilitated by Stateside Performance. Some manufacturers require the end user to contact them directly; in that case we will point you to the right contact. Email us with any warranty questions.

View full details

  • Free shipping over $250

    Free shipping applies to items that are shipped via ground through UPS or FedEx and are over $250 going to the continental 48 states. This does not apply to Alaska or Hawaii, and does not apply to any item(s) that are shipped via freight or with any other option other than ground shipping.

    Shipping policy 

  • 30-day returns

    Returns must be requested within 30 days of delivery. Parts must be new, unused, uninstalled, and in original packaging, with an RMA. Some items are final sale.

    Return policy