GMC Sierra 2500HD/3500HD Duramax Turbo Upgrade Guide
GMC, Sierra 2500HD/3500HD, Duramax 6.6L V8
Written for: rows 106, 108. Single-category Turbo comparison for GMC Sierra 2500HD/3500HD Duramax, an uncovered high-avg-price platform (row 106, strong: single-category comparison guides outperform broad multi-category builds; row 108, strong: Turbo and Supercharger categories lead impressions, F-150 and Sierra Supercharger already covered). Mirrors the Chevy/GMC twin-platform split that already works for the Supercharger guides. Pick-one comparison: category_scope is a single category (Turbos), body tells the reader to pick one turbo for their engine generation, not sum every option.
Plan your own version of this build in the GMC Sierra 2500HD/3500HD builder: pick your year and engine, stack parts that fit, and watch the labeled gains and the total cost add up.
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If your GMC Sierra 2500HD or 3500HD's stock turbo is tired, leaking, or you're chasing more air for towing, the catalog has real options across three generations of the 6.6L Duramax V8: the 2004.5-2010 LLY, LBZ, and LMM engines, the 2011-2016 LML, and the 2017-and-newer L5P. This guide covers turbo parts only. You're picking one turbo that matches your engine's generation, and maybe a coolant line upgrade to go with it, not adding up every part below into one build.
A factory turbo on a truck that tows regularly, runs at altitude, or just racks up miles is going to wear out eventually. That's normal wear, not a defect, and it's the most common reason an HD Duramax owner ends up shopping for a turbo in the first place. The second reason is wanting more air for a bigger power goal, which is a different conversation with different parts, covered below.
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Stock-spec replacements
If your turbo just died or wore out and you want the truck back to how it ran from the factory, three listings are built as direct OEM-spec swaps:
- BD Diesel Stock Turbo Replacement 17-19 Chevy/GM 6.6L Duramax L5P 2500/3500, named a stock turbo replacement, fits the 2017-2019 L5P.
- BorgWarner BorgWarner OEM Replacement Turbocharger | 2017–2019 GM 6.6L L5P Duramax, BorgWarner's OEM replacement turbocharger, also fits the 2017-2019 L5P.
- BorgWarner BorgWarner OEM Replacement Turbocharger | 2020–2023 GM 6.6L L5P Duramax is the same BorgWarner OEM replacement sized for the 2020-2023 L5P.
None of these three are marketed as power upgrades. They're meant to put the truck back where it started.
Upsized turbos
The rest of the lineup is sized up from stock, and the catalog names the compressor size right in most of the product names, which is the clearest spec these listings give:
- Duramax Tuner DURAMAX TUNER STEALTH STR TURBOCHARGER W/ACTUATOR 20-23 L5P / L5D, Duramax Tuner's Stealth STR with actuator, fits the 2020-2023 L5P and L5D.
- Duramax Tuner DURAMAX TUNER STEALTH MACH 1 (64) TURBO W/ACTUATOR 20-23 L5P / L5D, Duramax Tuner's Stealth Mach 1 at 64mm, same fitment.
- Duramax Tuner DURAMAX TUNER STEALTH MACH 2 (67) TURBO W/ACTUATOR 20-23 L5P / L5D, Duramax Tuner's Stealth Mach 2 at 67mm, the largest in that lineup, same fitment.
- Fleece Performance Fleece Performance 17-23 GM 2500/3500 6.6L L5P Duramax 63mm Cheetah Turbocharger, Fleece Performance's 63mm Cheetah turbo, fits the 2017-2023 L5P.
- Fleece Performance Fleece Performance 63mm Cheetah Turbo (Street Series), 2004.5-2010 LLY/LBZ/LMM, Fleece Performance's Street Series 63mm Cheetah, fits the older 2004.5-2010 LLY, LBZ, and LMM engines.
- BD Diesel BD diesel Screamer Turbo Chevy LML Duramax 2011-2016, BD Diesel's Screamer Turbo, fits the 2011-2016 LML.
- aFe Power aFe Power Bladerunner Turbocharger 88mm 11-16 GM Diesel Trucks V8-6.6L (td) LML (46-60292), aFe Power's Bladerunner at 88mm, the largest single turbo in this whole guide, also fits the 2011-2016 LML.
A bigger compressor generally trades a bit of low-end spool for more top-end air. In plain terms, a smaller turbo spins up faster off idle so the truck feels responsive right away, and a bigger one takes a moment longer to build boost but can flow more air once it's spinning, which matters more at higher rpm and higher power levels. Whether that trade makes sense depends on whether the truck is a daily driver, a tow rig that mostly runs in the low and mid rpm range, or something being built toward a bigger power number down the road.
None of these list a tested or claimed horsepower or torque number
Worth saying plainly instead of glossing over it. Every turbo in this guide, stock-spec and upsized alike, has no gain figure published in the catalog. That's not unusual for turbos specifically. A turbo by itself doesn't make power, it moves air, and how much power actually shows up depends on the fueling and the tune that go with it. Buying a bigger turbo without also sorting out fuel delivery and tuning is a common way to spend real money and feel very little, or to put more heat into an engine that isn't set up to handle it. If you're going the upsized route, plan the fueling and the tune as part of the same project, not as a follow-up purchase six months later, and lean on a shop that works on Duramax trucks regularly rather than guessing at the combination yourself. If a listing publishes a real gain number later, it'll show up here. Right now, none do.
Coolant lines and fittings
The L5P's turbo coolant routing shows up in this catalog too, separate from the turbos themselves:
- SRF SRF Turbo Coolant Fitting Upgrade, 2017-2026 L5P, SRF's coolant fitting upgrade, fits 2017-2026 L5P trucks.
- SRF SRF Turbo Coolant Hose Upgrade, 2017-2019 L5P, SRF's coolant hose upgrade for the 2017-2019 L5P specifically.
- SRF SRF Turbo Coolant Hose Upgrade, 2020-2026 L5P, the same hose upgrade sized for 2020-2026 L5P trucks.
- Pacific Performance Engineering (PPE) 2011-2016 GM 6.6L Duramax Turbo Coolant Feed Hose, PPE's coolant feed hose, fits the older 2011-2016 LML.
None of these move air or change power. If you're already pulling the turbo for a swap, price these alongside it instead of treating them as an afterthought later.
Install and cost
Every part in this guide carries roughly the same install picture from the catalog: a shop job running six to ten hours. That tracks with what turbo work actually involves on a Duramax. This isn't a bolt-on afternoon in the driveway for most owners, and it's worth planning around a shop visit rather than a weekend.
One legal note
Diesel emissions equipment is federally regulated under the Clean Air Act, and turbo work sits close enough to that system to be careful about, especially on a truck that's paired with a tune or with changes to the exhaust or intake side. Whether a specific swap keeps your truck emissions compliant depends on the exact part, the tune paired with it, whether it touches any emissions-related component, and your state's own inspection and registration rules on top of the federal picture. That's a legal question, not something answered here. Nothing in this guide is legal advice. Check with the seller directly about emissions compliance for your state before you buy, and if you're unsure, talk to a shop or an attorney who knows diesel emissions law where the truck is titled.
Where to start
If your turbo is dead or worn and you just want the truck running right again, start with the stock-spec replacements above. If you're building for more air and already have fueling and tuning planned, the sized-up options are where that conversation starts, matched to your engine generation first. Either way, check the coolant hose and fitting section while you're in there, since it's a lot cheaper to swap those with the turbo off than to do it twice.