67/67 vs 64/67 L5P Duramax Turbo — Which One Is Right For You?
Choosing the right turbocharger for your 2017-2023 6.6L L5P or L5D Duramax depends heavily on how the truck is used. Two of the most popular drop-in turbocharger configurations for the L5P platform are the 64/67 and 67/67 setups.
Both turbochargers dramatically improve airflow capability over the factory charger while retaining factory-style installation and strong drivability characteristics. However, each setup has unique strengths depending on whether the truck is primarily used for towing, daily driving, street performance, or higher horsepower applications.
If you're researching all available turbocharger options for your truck, visit our L5P / L5D Duramax Turbo Hub Page for a full breakdown of available upgrades.
64/67 L5P Turbo Overview
The 64/67 L5P Duramax Drop-In Turbo is designed for customers seeking excellent spool-up, towing performance, and strong low-end drivability while still gaining substantial airflow improvements over stock.
This turbocharger combination provides a very balanced setup for daily driven trucks and tow rigs that require fast response and reduced exhaust gas temperatures under load.
64/67 Turbo Benefits
- Fast spool-up characteristics
- Excellent towing performance
- Improved low-end response
- Lower EGTs under load
- Excellent daily driving manners
- Strong airflow improvement over stock
Best Applications for the 64/67
- Tow rigs
- Daily driven trucks
- Moderate tuning setups
- Street-driven diesel builds
- Customers prioritizing spool-up and drivability
67/67 L5P Turbo Overview
The 67/67 L5P Duramax Drop-In Turbo is aimed at customers wanting increased airflow capability and higher horsepower potential while still maintaining excellent street manners and towing capability.
Compared to the 64/67, the 67/67 offers additional top-end airflow and improved performance potential for customers planning larger fueling upgrades or more aggressive tuning.
67/67 Turbo Benefits
- Higher airflow capability
- Improved top-end performance
- Higher horsepower potential
- Excellent street performance
- Strong towing capability
- Retains variable vane functionality
Best Applications for the 67/67
- Higher horsepower builds
- Aggressive street trucks
- Competition-oriented builds
- Customers planning future fueling upgrades
- Tow rigs requiring additional airflow
Quick Comparison — 64/67 vs 67/67
| Feature | 64/67 | 67/67 |
|---|---|---|
| Spool-Up | Excellent | Very Good |
| Towing Performance | Excellent | Very Good |
| Horsepower Capability | Moderate-High | High |
| Street Performance | Excellent | Excellent |
| Low-End Response | Excellent | Very Good |
| Top-End Airflow | Very Good | Excellent |
Supporting Modifications
Both turbocharger setups benefit from supporting modifications that help maximize airflow efficiency, reliability, and drivability.
- Custom tuning
- Lift pump systems
- Transmission tuning
- High-flow intake systems
- Intercooler piping upgrades
- Exhaust upgrades
Related L5P Duramax Articles
Frequently Asked Questions
Which turbo spools faster, the 64/67 or 67/67?
The 64/67 typically offers slightly faster spool-up characteristics, making it ideal for towing and daily driving applications.
Which turbo makes more horsepower?
The 67/67 generally supports more airflow and higher horsepower capability compared to the 64/67 setup.
Is the 64/67 better for towing?
For dedicated towing applications, many customers prefer the 64/67 because of its excellent low-end response and drivability under load.
Can the 67/67 still tow well?
Yes. The 67/67 still performs very well while towing and provides additional airflow for trucks running larger fueling upgrades and aggressive tuning.
Do these turbos retain factory-style installation?
Yes. Both turbochargers are designed as direct drop-in replacements for the factory L5P Duramax turbocharger.
Final Thoughts
Both the 64/67 and 67/67 L5P Duramax turbochargers offer major improvements over the factory turbocharger. Choosing the right setup ultimately depends on how the truck is used and the long-term goals for the build.