2015.5–2016 LML 6.6L Duramax Parts Collection
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GM HD trucks parts for the 2015.5-2016 6.6 LML Duramax setups
This 2015.5-2016 LML 6.6L Duramax collection fits Chevy Silverado and GMC Sierra 2500HD/3500HD pickup trucks with DOC, DPF, and SCR/DEF exhaust hardware and the factory VGT turbo layout. It targets late-2015 and 2016 trucks with the 3-bolt downpipe flange. Early 2015 trucks with the V-band flange need parts from the 2011-2015 LML collection instead. Cab & Chassis (LGH) models aren't supported here.
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Feature |
2015.5–2016 |
|
Engine Version |
6.6L Duramax LML |
|
Supported Models |
Silverado/Sierra 2500HD/3500HD Pickup |
|
Tuner Options |
Mini Maxx V2, EZ Lynk AA3, EFI Live AutoCal V3 |
|
Unlock / ECM |
No ECM unlock required. Mini Maxx V2: Preloaded and ready to install. EFI Live & EZ Lynk: VIN & vehicle data required. |
|
SOTF Support |
SOTF available: Mini Maxx V2, EZ Lynk AA3, EFI Live AutoCal V3 |
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EGR Delete Kit |
Available in Full Delete Kits or as a standalone kit |
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Exhaust Options |
Delete pipe, 4" or 5" exhaust system, Muffler / No Muffler, 3-bolt downpipe configuration |
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Air/Fuel Upgrades |
S&B intake, FASS fuel system, intake bridge |
All LML delete kit options for late-model trucks
This LML Duramax delete kit selection focuses on emissions removal hardware, freer exhaust flow, and tuned drivability.
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Full delete bundles - ship with your choice of tuner (Mini Maxx V2 or EZ Lynk Auto Agent 3), EGR delete kit, and a choice of exhaust (DPF delete pipe, 4″ Downpipe-Back, or 5″ exhaust system). The EZ Lynk kit ships with a SOTF switch for physical power-level switching. All kits use the 3-bolt downpipe and fit 2015.5-2016 pickups only.
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DPF delete tuners - H&S Mini Maxx V1 and Mini Maxx V2 (plug-and-play dash-mounted units), EZ Lynk Auto Agent 3 (smartphone app, 0-+150HP, ships with SOTF switch), and EFI Live AutoCal V3 (custom LML DPF delete tuning, SOTF switch included). All flash through OBD-II, no ECM unlock required.
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DPF & CAT Delete Pipe - 4″ T-409 stainless steel delete pipe with 3-bolt flange, mandrel-bent, replaces the factory DPF and catalytic converter section. Optional T-409 stainless steel muffler available.
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EGR & Cooler Delete Kit - block-off plates, cooler delete hardware, gaskets, and mounting hardware. Covers 2011-2016 LML Duramax (both V-band and 3-bolt flange trucks). Sold standalone or included in a full kit.
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Exhaust systems - 4″ Downpipe-Back and 5″ T-409 stainless steel exhaust systems for 2015.5-2016 with the 3-bolt flange. Both available as straight race pipe or with muffler. All bolts, clamps, and hangers included.
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S&B Cold Air Intake - high-flow air intake with cleanable cotton or dry filter, replaces the factory airbox for improved airflow. Intake Bridge - reinforced replacement pipe between the intake elbow and turbo for consistent boost delivery on LML 6.6L.
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FASS Titanium Signature Fuel System - replaces the factory lift pump to protect the CP4.2 injection system from water contamination and debris - a known reliability concern on LML 6.6L. Higher flow rate and cleaner fuel delivery under tow and high-boost conditions.
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Replacement Up Pipe High Flo - passenger-side up-pipe upgrade for improved exhaust flow between the manifold and turbo on 6.6L Duramax 2001-2016.
Dieselino fitment and support for Duramax trucks
Dieselino performance parts follow the 3-bolt flange layout and SCR/DPF routing on late 2015 GM diesels. Tech support confirms fitment, while warranty coverage applies to all provided hardware.
- T-409 stainless steel piping with mandrel bends and welded sensor bungs.
- Tuner platform support: EZ Lynk Auto Agent 3, Mini Maxx V1/V2, and EFI Live AutoCal V3, with file guidance.
- Remote tuning assistance from diesel techs for file setup and troubleshooting.
- Order tracking provided for U.S. and Canada shipments from checkout to delivery.
FAQs
2015.5 and 2016 trucks use a 3-bolt downpipe flange, while 2011-early 2015 trucks use a V-band clamp, so the front pipe hardware changes. DEF, and EGR removal stays similar, but you’ll need to confirm ECM and tuner support before ordering an LML Duramax delete kit.
- EFI Live AutoCal V3 is the best fit for an LML Duramax build when you want custom tune files and deeper control of the engine tables and datalogging. It’s the usual choice for multi-stage setups.
- EZ Lynk AutoAgent 3 works well when you prefer phone-based monitoring and remote tuning support, with quick file updates on a 6.6 Duramax.
- Mini Maxx V2 / H&S Mini Maxx is the simplest option when you want a screen, basic monitoring, and straightforward on-device tune loading.
A correct LML DPF delete tuner presets can add 40-60 HP on tow files, 80-120 HP on street files, and 120-140 HP on race files. Keep sustained EGT under 1,250°F and boost logs in the 28-35 psi range to unlock the full potential of your delete kit.
With EGR delete on a 6.6 LML Duramax, tow tuning often adds 40-60 HP. Steady highway fuel economy usually shifts +1 to +3 MPG. Many customers claim +25,000 to +75,000 miles before major engine work after an EGR/DPF removal with conservative tuning, but results may vary. Oil-analysis comparisons report 40-60% lower soot and roughly 40-50% lower wear metals on modified setups.
Engine performance and engine reliability depend on EGT control and maintenance.
Verify 2015.5-2016 fitment with the 3-bolt downpipe flange and correct sensor connectors.
- Load the tune before installation, then soak fasteners and disconnect sensors.
- Remove the stock exhaust from the downpipe back, keeping hangers.
- Install delete pipes front to rear, align bungs and hangers, then tighten clamps.
- Torque the flange evenly and check driveshaft/crossmember clearance.
- Start the truck, check leaks, and re-torque after one heat cycle.
Time to install an LML Duramax delete kit: 3-5 hours professional installation, 6-10 hours first-time.
A 6.6L Duramax with an LML delete kit is not legal for public-road use, and it is sold for off-road use only. An LML EGR removal kit can trigger inspection failure and road-use compliance issues, even if the truck runs clean and steady. A DPF delete pipe setup may also void warranty coverage on related engine and exhaust claims, depending on the dealer’s policy.