Guide to SCR, DPF, DEF, and EGR Removal for Detroit Diesel Engines
Disclaimer: This guide is for informational purposes only. Removing emission control systems is illegal in many jurisdictions and can result in penalties. Always comply with local, state, and federal laws.
Detroit Diesel engines, including DD13, DD15, and DD16 models, come equipped with an emissions control system consisting of a Diesel Particulate Filter (DPF), Exhaust Gas Recirculation (EGR), Diesel Exhaust Fluid (DEF), and Selective Catalytic Reduction (SCR). These systems are designed to reduce emissions but can cause maintenance issues and performance losses. This guide details the steps to remove these components properly.
Step 1: ECM Reprogramming
Before making any physical changes, the Engine Control Module (ECM) must be reprogrammed to disable the emission control features.
Why ECM Tuning is Necessary?
- Prevents engine errors and diagnostic trouble codes (DTCs)
- Disables limp mode
- Optimizes engine efficiency and fuel economy
- Allows the engine to run without DEF fluid or DPF regenerations
Professional ECM tuning is required to ensure the engine runs correctly. At DPF DELETE SHOP, we offer remote ECM tuning services to remove DPF, EGR, DEF, and SCR restrictions while maintaining engine safety.
Physical Modifications
After successful ECM reprogramming, proceed with the physical removal or deactivation of the emission components.
Step 2: EGR System Delete
EGR (Exhaust Gas Recirculation) System
The EGR system recirculates a portion of the exhaust gases back into the engine’s intake to reduce nitrogen oxide emissions. To deactivate:
- Blocking EGR Flow: Install block-off plates on both the “hot” and “cold” sides of the EGR system.
- Hot Side: Place a steel plate where the EGR manifold connects to the exhaust manifold.
- Cold Side: Place a steel plate where the EGR manifold connects to the intake manifold.
On the photo below You will see place where block off plates(expansion plugs in this case) go.
The photo is taken on Detroit Diesel DD15, but DD13 & DD16 are very similar.
DetroitDiesel DD15 exhaust side block off plate location
- We used expansion plugs, to block both ends of flex pipe.
Flex pipe blocked off on DD15
- Below is the photo of intake side – crossover pipe.
Unbolt corssover pipe, and put a plate between it & intake manifold.
The photo is taken on Detroit Diesel DD15, but DD13 & DD16 are very similar.
Detroit Diesel DD15 intake side block off plate location (crossover pipe)
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Step 3: One-Box System Modifications (DPF, DOC, SCR Removal)
Detroit Diesel engines feature an integrated One-Box system containing:
- Diesel Oxidation Catalyst (DOC)
- Diesel Particulate Filter (DPF)
- Selective Catalytic Reduction (SCR)
To modify these components:
DPF and DOC:
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- Remove the One-Box assembly from the vehicle.
- Open the assembly and extract the filter materials from both the DPF and DOC sections.
- DOC must be hollowed out as well, on the photo below arrows point out to DOC filter.
Detroit Diesel DD15 DPF cans after delete
SCR DELETE:
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- The SCR unit is more complex due to its construction.
- Carefully cut open the SCR housing.
Cutting open SCR filters on DD15
- Remove the internal catalyst materials.
Hollowing out SCR filters on DD15
- Weld the housing back securely to prevent exhaust leaks.
Welding back shut SCR cans on DD15
Note: Modifying the One-Box assembly requires precision to ensure structural integrity and proper exhaust flow. It’s recommended to consult with professionals experienced in exhaust system modifications.
Post-Modification Considerations
- Sensor Management: After removing or disabling emission components, address any associated sensors. This may involve disconnecting or simulating sensor inputs to prevent error codes.
- Regular Maintenance: Even with these modifications, continue regular engine maintenance to ensure longevity and performance.
- Legal Implications: Always consider the legal ramifications of such modifications. Operating a vehicle without mandated emission controls on public roads is illegal in many areas and can result in fines or other penalties.
Why Choose DPF DELETE SHOP?
At DPF DELETE SHOP, we specialize in remote ECM tuning services for all Detroit Diesel engines. Our services include:
✅ Professional DPF, EGR, DEF, and SCR deletion
✅ Safe and reliable ECM tuning
✅ Increased fuel efficiency and engine longevity
✅ Remote tuning via TeamViewer for fast service
Contact us today to get your Detroit Diesel DPF Delete professionally done!