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01-05 Chevy Duramax LLY EGR Block Off Plate
01-05 Chevy Duramax LLY EGR Block Off Plate
Item# SSM-EGR-BOP-LLY
Regular price: $39.95
Sale price: $24.95

Product Description

01-05 Chevy Duramax 6.6L Diesel EGR Block Off Plate

  • This EGR Blocker Plate Is For GM 2500/3500 LLY & LB7 6.6L Duramax Diesel Engines (Years: 2001, 2002, 2003, 2004, 2004.5, 2005). It easily installs on the EGR tube to shut off the "Exhaust Gas Recirculation" (EGR) flow back into the intake manifold. Plate is made from Stainless Steel. Does not fit 2006-07 Models.

  • On 01-04 trucks, only California and Northeastern emission trucks and some federal emission trucks have an EGR valve and tube. Most others do not unless they were originally produced for one of the areas above. Check you truck before purchasing.


The “Blocker Plate” is just as the name implies. It is an aftermarket-machined plate made to slide into the EGR exhaust connection flange to block off the flow of emission gases to the EGR. Some believe that this results in an internally cleaner engine due to no longer re-circulating sooted exhaust gases through the engine intake to be reused during the combustion process. Some forum members report the following additional benefits when the plate is installed: A slight increase in MPG’s, a slight decrease in EGT temperatures, more engine power, quicker turbo spool-up and a slightly quieter running engine. A few members have also noted just the opposite.

Will installing the blocker plate cause DTC codes and a Service Engine Soon light?

Installing a Blocker Plate will cause the PCM to display EGR related DTC error codes due to the lack of airflow to the EGR. Forum members report that on vehicles with Federal Emission standards the SES light usually will not illuminate. On vehicles having CA and Northeast emission standards chances are the SES light will illuminate. The Override Circuit Finger Stick can be installed to prevent DTC’s and SES illumination. It is still unknown as to exactly how / if the ECM compensates when the plate is installed without the Stick. Some race programmers can modify the MAP output and disable the EGR which will in turn make the light turn off. EFI Live is one such program.

The Override Circuit "Finger Stick" is available threw us also.

Note: The 01-04 LB7 Motor Has a Vacuum Operated EGR Valve Not an Electric Valve and can not use the "Finger Stick" Override Circuit.



Any installation you make is done at your own risk. Any manufacturer can not and will not be responsible for any damages, real or perceived, to you, your truck, or your marital life in whole or in part. Same goes for these installation directions. I did this as a favor to the forum members to save them some reading time on an interesting subject. Read all these directions before installing. Ask questions first, install second.