Description
Complete EGR Valve & Cooler Delete Kit for 2006-2007 GM Duramax LBZ 6.6L Diesel
This comprehensive EGR delete kit completely removes the failure-prone EGR valve and EGR cooler assembly from your 2006-2007 Chevrolet Silverado or GMC Sierra equipped with the legendary 6.6L Duramax LBZ diesel engine. The LBZ's EGR system is a known weak point — cooler failures can lead to catastrophic coolant loss, hydrolock, and engine damage. This kit eliminates that risk permanently while improving airflow, reducing intake temperatures, and simplifying the engine bay.
⚠️ OFF-ROAD USE ONLY: This product is intended solely for off-road, racing, and competition vehicles not operated on public highways. Removing or tampering with emissions control equipment is prohibited by federal law for on-highway vehicles. Verify local regulations before purchasing.
Key Features
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Complete System Removal: Includes blocker plate, coolant bypass fittings, intake manifold block-off, and all required hardware — removes both EGR valve and cooler
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Billet Aluminum Up-Pipe Block-Off: CNC-machined 6061-T6 aluminum block-off replaces EGR feed from passenger side up-pipe — zero exhaust gas reaches the intake
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Coolant Reroute Kit: Includes brass hose barb and high-temperature silicone cap to properly bypass EGR cooler coolant circuit without restricting heater core flow
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Prevents Catastrophic Engine Failure: LBZ EGR coolers are known to rupture internally, dumping coolant directly into the intake — this kit eliminates that failure mode entirely
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Improved Throttle Response: Removing EGR reduces intake air temperature by up to 100°F, increasing air density and improving combustion efficiency
Compatibility
| Year |
Make |
Model |
Engine |
| 2006-2007 |
Chevrolet |
Silverado 2500HD/3500HD (Classic) |
6.6L Duramax LBZ (RPO: LLY/LBZ) |
| 2006-2007 |
GMC |
Sierra 2500HD/3500HD (Classic) |
6.6L Duramax LBZ (RPO: LLY/LBZ) |
Technical Specifications
| Component |
Material |
Detail |
| EGR Blocker Plate |
304 Stainless Steel |
3mm thick, laser-cut to port |
| Up-Pipe Block-Off |
6061-T6 Billet Aluminum |
CNC-machined with O-ring groove |
| Coolant Bypass Fitting |
Brass |
3/4 inch hose barb |
| Silicone Cap |
High-Temp Silicone |
Rated 400°F continuous |
| Intake Block-Off |
304 Stainless Steel |
Precision-fit with gasket |
Why Delete the LBZ EGR System?
The Duramax LBZ is widely considered the best pre-emissions Duramax engine — but the EGR system is its weak link. When the EGR cooler fails internally (common on high-mileage LBZs), coolant is drawn directly into the intake manifold. Best case: white smoke and coolant loss. Worst case: hydrolock bends a connecting rod. This kit permanently removes that failure mode. Your LBZ will run cleaner, cooler, and more reliably for the long haul.
Frequently Asked Questions
Q: Does this require an ECU tune to prevent check engine light?
A: Yes. Removing EGR triggers DTCs P0401-P0406. A custom ECU tune disabling EGR-related DTCs is required to prevent CEL and limp mode. EFILive and HP Tuners support this modification.
Q: Will this affect my cooling system?
A: No. The kit includes a coolant bypass fitting maintaining proper flow through the heater core circuit. EGR cooler is isolated without restricting flow to other components.
Q: How long does installation take?
A: Plan 4-6 hours for first-time DIY. Hardest part is accessing EGR cooler bolts on passenger side. Professional shops typically complete in 3-4 hours.
Q: Does this fit the LLY (2004.5-2005) Duramax?
A: No, this kit is specific to 2006-2007 LBZ. The 2004.5-2005 LLY uses a different EGR cooler design and up-pipe configuration. Verify engine RPO code before ordering.
Q: What tools do I need?
A: Metric socket set (8mm-15mm), extensions and swivel adapters, torque wrench, flathead screwdriver, hose clamp pliers, coolant catch pan.
