2004.5-2005 6.6L LLY Duramax EGR Delete Kit
This kit provides the listed mechanical components for removing the factory EGR valve and EGR cooler assembly on specified 2004.5-2005 Chevrolet Silverado and GMC Sierra trucks equipped with the 6.6L LLY Duramax diesel engine. It uses an exhaust block-off, a replacement high-flow intake elbow and a coolant hose to close the exhaust connection and reconnect the coolant path associated with the removed EGR hardware.
This is an EGR delete kit only. It is not a DPF delete kit, CCV reroute kit or electronic tuning package. No tuner, ECU software or programming device is shown in the package contents. Confirm the engine code, factory EGR layout, emissions configuration and tuning requirements before ordering.
Fitment
| Years | Make | Model | Engine |
|---|---|---|---|
| 2004.5-2005 | Chevrolet | Silverado 2500HD | 6.6L LLY Duramax diesel |
| 2004.5-2005 | Chevrolet | Silverado 3500 | 6.6L LLY Duramax diesel |
| 2004.5-2005 | GMC | Sierra 2500HD | 6.6L LLY Duramax diesel |
| 2004.5-2005 | GMC | Sierra 3500 | 6.6L LLY Duramax diesel |
Fitment checks required before ordering
- Confirm the engine code is LLY; displacement alone does not confirm compatibility.
- Confirm the factory EGR valve, cooler, intake and coolant-system layout.
- Confirm the vehicle's original emissions configuration and market specification.
- Confirm whether the truck is identified as a 3500 or 3500HD in the applicable vehicle and product records.
- Existing intake, turbo, cooling-system, sensor or emissions-related modifications may affect installation.
- Transmission, drive configuration and body-style coverage have not been separately stated in the available product information.
- Listed fitments only. Do not select this kit for LB7, LBZ, LMM, LML or another Duramax engine code.
Specifications
| Brand | FLASHARK |
|---|---|
| Product Type | EGR Delete Kit with High-Flow Intake Elbow |
| Engine | 6.6L LLY Duramax diesel |
| Available Colors | Blue or Black |
| Blue SKU | FLOS20046-BL |
| Black SKU | FLOS20046-BK |
| Listed Weight | 1,435 g |
| Listed Size | 36.5 × 22.5 × 12 cm |
| Listed Position | Front |
| Tune or Programmer Included | No tuner, software or electronic module is listed as included |
Key Features
- LLY-specific listed application: Intended for the listed 2004.5-2005 6.6L LLY Duramax diesel trucks; confirm the engine code before ordering.
- EGR exhaust block-off: The listed nickel-plated steel component closes the exhaust-side connection after the applicable factory EGR hardware is removed.
- High-flow intake elbow: Replaces the related intake elbow section included in this EGR delete configuration.
- Coolant-path hardware: Includes a coolant hose and clamps for reconnecting the coolant path associated with the removed EGR cooler.
- Installation hardware: Includes the listed M8 and M10 fasteners and an intake-elbow O-ring.
- Two color options: Blue and Black versions are offered under separate SKUs.
What This EGR Delete Kit Changes
The factory EGR system recirculates a controlled amount of exhaust gas through the EGR valve and cooler. According to the listed product configuration, this kit is designed for removal of the applicable EGR valve and cooler hardware. The exhaust-side opening is closed with a block-off component, the related intake section is replaced with the supplied elbow, and the supplied hose is used to reconnect the affected coolant path.
“Delete,” “block-off” and “bypass” describe different parts of this mechanical process. The kit removes the listed EGR hardware, blocks the applicable exhaust connection and reroutes or reconnects the related coolant path. It does not perform a DPF delete or CCV reroute, and it does not electronically change the ECU calibration.
What Is Included
- 1 × nickel-plated steel exhaust block-off
- 1 × coolant hose
- 2 × hose clamps
- 1 × M10 × 20 mm hex-head bolt
- 2 × M8 × 30 mm Allen bolts
- 2 × M10 × 30 mm hex bolts
- 2 × M8 × 20 mm hex bolts
- 1 × high-flow intake elbow
- 1 × high-flow intake elbow O-ring
Not listed as included: ECU tuning, a programmer, electronic modules, installation instructions, replacement exhaust components, a DPF delete pipe or a CCV reroute kit.
Related LLY Duramax Products
Browse the 6.6L Duramax collection for other engine-specific parts.
- DPF Delete Race Pipe — a separately sold exhaust-system product; it is not included with this EGR kit.
- CCV Reroute Engine Ventilation Kit — a separately sold crankcase-ventilation product; it is not part of this EGR kit.
- EGR/DPF/CCV PCV Reroute for 2004-2005 LLY 6.6L Duramax All-in-One Kit — for buyers specifically comparing a combined package.
Confirm fitment, included parts, tuning requirements and applicable emissions regulations separately for every linked product.
Tune and Programming Requirements
No tuner, ECU software, programming service or electronic module is listed in this package. The available product information does not confirm whether a calibration change is required for every listed vehicle configuration.
Before installation, consult the product supplier and a qualified Duramax technician about the vehicle's calibration, diagnostic strategy and intended use. Do not assume that the mechanical kit alone will prevent an EGR-related check engine light or diagnostic trouble code.
Installation Notes
- No installation instructions are currently listed with the kit.
- Removal of the EGR cooler may require draining or controlling engine coolant.
- Allow the engine to cool fully before opening the cooling system.
- Check hose routing, clamps, sealing surfaces and fastener engagement before final assembly.
- Refill and bleed the cooling system using the correct procedure for the vehicle.
- After installation, inspect for coolant, intake and exhaust leaks.
- Professional installation by a technician familiar with LLY Duramax EGR and cooling systems is recommended.
Possible CEL and Factory-System Effects
Removing or disabling factory EGR hardware can affect the vehicle's emissions-control and diagnostic logic. Depending on the original calibration, emissions configuration, vehicle condition and installation, an EGR-related check engine light or diagnostic trouble code may occur. The available product evidence does not support a guarantee of no CEL, no fault codes or unchanged operating behavior.
Stop operating the vehicle and inspect the installation if there is a coolant leak, abnormal temperature indication, intake or exhaust leak, unexpected warning light or reduced-power condition.
Who This Kit Is For
- Owners of a listed 2004.5-2005 Chevrolet Silverado or GMC Sierra with a confirmed 6.6L LLY Duramax engine.
- Buyers who understand which factory EGR components are being removed and blocked.
- Vehicles whose factory EGR layout matches the supplied mechanical components.
- Buyers who have confirmed the necessary installation, tuning and legal requirements before purchase.
Who Should Not Buy This Kit
- Vehicles that must retain the complete factory emissions system.
- Trucks with an unconfirmed engine code or emissions configuration.
- LB7, LBZ, LMM, LML or other non-LLY Duramax applications.
- Buyers expecting a tuner, ECU software, DPF delete pipe or CCV reroute kit in the package.
- Buyers requiring a guarantee of no CEL, no fault codes, inspection approval or road-use legality.
- Vehicles whose existing modifications prevent confirmation of the original EGR, intake or cooling-system layout.
Emissions and Road-Use Notice
This product is designed to remove or disable components of the factory EGR emissions-control system. Laws governing the manufacture, sale, installation and use of emissions-related parts vary by jurisdiction and vehicle application.
No product-specific EPA or CARB exemption, road-use approval or emissions-testing certification has been provided in the available product information. Confirm all federal, state and local requirements before purchase or installation. Do not install this product on a vehicle that is legally required to retain the affected factory emissions equipment.
Modification may also affect emissions testing, registration, manufacturer warranty or insurance. The buyer and installer are responsible for confirming the requirements applicable to the vehicle and its intended use.
Shipping & Returns
Free U.S. Shipping: Orders are typically processed within 1–2 business days and delivered within 7–9 business days. Additional charges may apply to remote areas.
30-Day Returns: Unopened and unused items in their original packaging may be returned within 30 days of receipt. Return shipping is covered for verified quality issues.
Worry-Free Delivery: Optional protection against eligible loss, theft, delay, or transit damage is available at checkout.
2004.5-2005 LLY Duramax EGR Delete Kit FAQs
Q1: What factory system does this kit change?
A1: It is an EGR delete kit intended to remove the applicable factory EGR valve and cooler, block the related exhaust connection and reconnect the affected coolant path.
Q2: Which engine code does it fit?
A2: The listed application is the 6.6L LLY Duramax diesel. Confirm the engine code before ordering because the 6.6L displacement alone is not enough to establish fitment.
Q3: Does it fit every 2004 Duramax?
A3: No such claim is supported. The detailed fitment list begins at 2004.5. Confirm the production application and LLY engine code before purchase.
Q4: Is this a complete EGR, DPF and CCV delete kit?
A4: No. This page is for an EGR delete kit. DPF exhaust components, CCV reroute parts and combined packages are separate products.
Q5: What parts are included?
A5: The listed package includes an exhaust block-off, coolant hose, two clamps, a high-flow intake elbow, an O-ring and the listed M8 and M10 fasteners.
Q6: Does the package include a tuner or ECU software?
A6: No tuner, software, programming service or electronic module is listed as included.
Q7: Is an ECU tune required?
A7: The available product information does not confirm one requirement for every vehicle. Ask the supplier and a qualified LLY Duramax technician before installation.
Q8: Can the kit cause a check engine light?
A8: Removing factory EGR hardware can affect diagnostic monitoring. A CEL or EGR-related fault code may occur depending on the calibration, vehicle configuration and installation.
Q9: Can the truck enter reduced-power or limp mode?
A9: The available evidence does not establish the behavior of every calibration. Do not assume normal operation without first confirming the vehicle's tuning and diagnostic requirements.
Q10: Does it work with the stock intake, turbo and sensors?
A10: Compatibility with every stock or modified intake, turbo and sensor configuration has not been documented. Compare the supplied parts with the factory layout before disassembly.
Q11: Are additional gaskets or supplies required?
A11: The package list does not confirm every gasket, sealing product, fluid or workshop consumable. Inspect the kit and obtain any configuration-specific supplies before installation.
Q12: Does installation require coolant work?
A12: Removal of the EGR cooler affects its coolant connections and may require draining, refilling and bleeding the cooling system.
Q13: Is professional installation recommended?
A13: Yes. Installation should be handled by a technician familiar with LLY Duramax EGR, intake and cooling-system service.
Q14: Is the modification completely reversible?
A14: Complete reversibility is not guaranteed. Reinstallation depends on retaining usable factory components and avoiding irreversible changes during removal.
Q15: Can this kit affect emissions testing, registration, warranty or insurance?
A15: Yes. Removing factory emissions hardware may affect each of these areas. Confirm the laws, policies and vehicle requirements that apply before purchase or installation.