Upgrading your L5P Duramax engine can really take its performance to the next level, but with so many options out there, it’s crucial to pinpoint the ones that fit your model year perfectly. From top-notch fuel filter kits to durable aluminum coolant hoses, each upgrade brings unique advantages like enhanced durability and easier installation. Whether you’re after better coolant flow or a powerful exhaust system, these upgrades are crafted to unlock your engine’s full potential while ensuring everything works seamlessly with your vehicle.
In this review, I’m diving into ten of the best L5P upgrades currently on the market. Each product is tailored for specific model years, so you can easily find the perfect match for your Duramax engine. I’ll emphasize standout features like material quality, ease of installation, and performance benefits to help you weigh your options and select the upgrade that best suits your needs.
⚡ Quick Verdict
Our Top Picks at a Glance
| Image | Product | Score | Link |
|---|---|---|---|
 |
Fleece Performance – 17-19 GM Duramax 6.6L L5P Fuel Filter U 🏆 Editor’s Pick |
9.0/10 |
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Banks Power – 2020 GM 2500/3500 6.6L L5P Boost Tube Upgrade 💰 Best Value |
8.5/10 |
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 |
Upgrade TP1015 Fuel Filter and 134001 Aluminum Housing Cap w | 7.8/10 |
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LELEHOKA 4 Inch Exhaust Pipe System Compatible with 2017-202 | 8.1/10 |
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EVIL ENERGY Upper Coolant Hose Kit for 2017-2019 L5P Duramax | 7.5/10 |
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EVIL ENERGY Upper Coolant Hose Kit for 2020-2025 L5P Duramax | 7.6/10 |
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 |
SupplyMount 66793 – Aftermarket Replacement Derringer 6.6L L | 6.9/10 |
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Performance EPC Blocker for Allison Transmission, GM 2011-20 | 8.2/10 |
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Billet Compressor Wheel for 6.6l Duramax L5P 2017-21 Chevy G | 7.0/10 |
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 |
BILLET HIGH PERFORMANCE INPUT SHAFT – ALLISON 1000/GM TRANSM | 7.3/10 |
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📋 How We Evaluated
Products were evaluated based on build quality, performance enhancements, ease of installation, and user suitability. Additionally, attention was paid to the overall value and any available warranty offerings. These factors collectively contribute to the effectiveness and reliability of each upgrade option.
Detailed Reviews
Fleece Performance – 17-19 GM Duramax 6.6L L5P Fuel Filter U🏆 Editor’s Pick
| Fuel Filter Micron Rating | 4 microns |
| Includes | Water separator, filter base, quick disconnect fittings |
| Compatible Models | 2017-2019 L5P Duramax |
| Monitoring Port | 1/8″ NPT for fuel pressure |
What We Found
The Fleece Performance Fuel Filter Upgrade Kit significantly boosts fuel filtration with its 4 micron filter and water separator. This kit comes complete with a filter base that has integral mounting and quick disconnect fittings, making installation a breeze. It replaces specific OEM parts, ensuring reliable compatibility. Plus, the addition of a fuel pressure monitoring port gives you extra functionality for performance tuning.
Who It’s For
This product is perfect for L5P Duramax owners who want to enhance fuel delivery and protect their engine. It’s especially useful for those who frequently tow or haul heavy loads, as it helps maintain clean fuel delivery even under demanding conditions. DIY mechanics will appreciate how straightforward the installation is.
✅ Pros
- Enhances fuel filtration for better engine performance.
- Easy installation process with included fittings.
- Durable construction ensures long-lasting use.
❌ Cons
- Price not listed may deter budget-conscious buyers.
- Limited compatibility with older models.
- No customer ratings available for performance verification.
💬 Our Take
The Fleece Performance Fuel Filter Upgrade Kit really shines with its excellent filtration and easy installation, making it a top pick for dedicated L5P Duramax enthusiasts.
Banks Power – 2020 GM 2500/3500 6.6L L5P Boost Tube Upgrade 💰 Best Value
| Material | Mandrel-bent aluminized steel |
| Flow Area Increase | 67% |
| Compatibility | Stock and aftermarket intercoolers |
| Included Components | Intercooler ducting, boost tubes |
What We Found
The Banks Power Boost Tube Upgrade Kit offers a notable 67% increase in cold side flow area compared to stock tubes. Its mandrel-bent aluminized steel design ensures durability while enhancing cooling capacity. This kit is built for direct compatibility with both stock and aftermarket intercoolers, which helps to boost performance in demanding situations.
Who It’s For
This is an ideal choice for anyone looking to get the most out of their L5P Duramax, particularly in high-tow scenarios. Whether you’re a daily driver or a performance enthusiast, this kit prioritizes engine cooling efficiency.
✅ Pros
- Significantly improves cooling capacity.
- Durable construction for long-term use.
- Direct fit with no modification needed.
❌ Cons
- Price not listed may be a concern for some.
- No customer rating data available.
- Intercooler compatibility may limit options.
💬 Our Take
The Banks Power Boost Tube Upgrade is a fantastic option, delivering significant performance enhancements that can greatly benefit L5P Duramax owners.
Upgrade TP1015 Fuel Filter and 134001 Aluminum Housing Cap w
| Compatibility | 2017-2024 L5P Duramax |
| Material | CNC-machined aluminum |
| Warranty | 2 years |
| Includes | Fuel filter and aluminum housing cap |
What We Found
The Upgrade TP1015 Fuel Filter Kit features an aluminum housing cap with a drain plug, making maintenance a lot easier. Compatible with 2017-2024 L5P Duramax engines, it ensures a perfect fit and dependable performance. Plus, it comes with a generous 2-year warranty, showing confidence in its durability and functionality.
Who It’s For
This kit is great for L5P Duramax owners looking for a straightforward, reliable replacement for their fuel filter. It suits both casual drivers and those who regularly handle their vehicle maintenance.
✅ Pros
- Easy installation with direct fit.
- Aluminum construction enhances durability.
- Includes drain plug for hassle-free maintenance.
❌ Cons
- Compatibility limited to specific models.
- No customer rating data available.
- Price not listed may hinder informed decisions.
💬 Our Take
The Upgrade TP1015 Fuel Filter and Housing Cap Kit is a smart pick for anyone wanting durable replacement parts with convenient maintenance features.
LELEHOKA 4 Inch Exhaust Pipe System Compatible with 2017-202
| Pipe Diameter | 4 inches |
| Compatibility | 2017-2024 L5P Duramax |
| Installation | Complete turbo-back system included |
| Construction | Heavy-duty design for performance |
What We Found
The LELEHOKA 4 Inch Exhaust Pipe System enhances exhaust flow efficiency with its robust 4-inch diameter. This heavy-duty turbo-back system ensures a direct fit for 2017-2024 L5P Duramax models. It’s designed for optimal performance and comes with everything you need for a complete installation.
Who It’s For
If you’re an L5P Duramax owner seeking a performance boost in exhaust flow, this is your product. It’s especially beneficial for those who tow often or drive with heavy loads, as it improves engine efficiency.
✅ Pros
- Improves exhaust flow for better performance.
- Designed for a direct factory fit.
- Includes all necessary installation components.
❌ Cons
- No customer rating data available.
- Price not listed may deter some buyers.
- Installation may require professional assistance.
💬 Our Take
The LELEHOKA Exhaust Pipe System significantly enhances exhaust flow, making it a valuable upgrade for performance-focused L5P Duramax owners.
EVIL ENERGY Upper Coolant Hose Kit for 2017-2019 L5P Duramax
| Compatibility | 2017-2019 L5P Duramax |
| Material | Aluminum with silicone couplers |
| Includes | T-bolt clamps for secure connection |
| Installation | Direct fit without modifications |
What We Found
The EVIL ENERGY Upper Coolant Hose Kit replaces the factory upper radiator hose with a durable aluminum design. It includes 5-ply silicone couplers and T-bolt clamps for a secure connection. Specifically designed for 2017-2019 L5P Duramax models, it offers a direct fit without any modifications needed.
Who It’s For
This kit is perfect for L5P Duramax owners keen on improving engine cooling efficiency. It’s great for those who care about maintaining a clean engine bay and ensuring reliable performance during tough drives.
✅ Pros
- Improves engine cooling efficiency.
- Durable aluminum design enhances longevity.
- Easy installation with no modifications required.
❌ Cons
- Limited to specific model years.
- No customer rating data available.
- Price not listed may hinder purchase decisions.
💬 Our Take
The EVIL ENERGY Upper Coolant Hose Kit is a solid upgrade for those focused on engine cooling and aesthetics, making it a worthwhile investment.
EVIL ENERGY Upper Coolant Hose Kit for 2020-2025 L5P Duramax
| Compatibility | 2020-2025 L5P Duramax |
| Material | Aluminum with silicone couplers |
| Includes | T-bolt clamps for secure connection |
| Installation | Direct fit without modifications |
What We Found
The EVIL ENERGY Upper Coolant Hose Kit for 2020-2025 L5P Duramax offers a high-quality aluminum replacement for your upper radiator hose. It comes with 5-ply silicone couplers and T-bolt clamps, ensuring a secure and trustworthy fit. Designed to follow the original routing path, it makes for a straightforward installation.
Who It’s For
Best for L5P Duramax owners looking to enhance their cooling system, this product is ideal for those who value durability and a cleaner engine bay appearance.
✅ Pros
- Enhances cooling system efficiency.
- Durable construction for long-lasting use.
- No modifications needed for installation.
❌ Cons
- Compatibility limited to newer models.
- No customer rating data available.
- Price not listed may be a concern.
💬 Our Take
The EVIL ENERGY Upper Coolant Hose Kit for 2020-2025 is a practical choice for maintaining cooling efficiency while upgrading the look of your engine bay.
SupplyMount 66793 – Aftermarket Replacement Derringer 6.6L L
| Compatibility | Banks systems |
| Construction | Durable materials |
| Design | Direct fit for easy installation |
| Performance | Meets industry standards |
What We Found
The SupplyMount Aftermarket Replacement Derringer is designed for reliable compatibility with Banks systems. This component is built for durability and engineered to meet industry performance standards. It is an easy installation option for those upgrading their L5P Duramax.
Who It’s For
This product is great for shoppers seeking a dependable match without complicating their decision. It’s worth considering if its size, features, warranty, and recent buyer feedback align with your intended use of these L5P upgrades.
✅ Pros
- Direct fit for simple installation.
- Built for durability in demanding applications.
- Compatible with popular upgrade systems.
❌ Cons
- No customer ratings available.
- Price not listed may deter some buyers.
- Limited information on performance metrics.
💬 Our Take
The SupplyMount Derringer offers a handy replacement option for Banks systems, making it a solid choice for dependable performance.
Performance EPC Blocker for Allison Transmission, GM 2011-20
| Compatibility | GM 2011-2019 LML L5P |
| Installation | Requires draining transmission fluid |
| Benefits | Improved shift quality, increased clutch holding power |
| Design | Simple installation process |
What We Found
The Performance EPC Blocker for Allison Transmission improves shift quality for LML and L5P models. It supports higher horsepower and torque, which is particularly beneficial for modified trucks. The installation is straightforward and requires minimal disassembly, making for an efficient upgrade process.
Who It’s For
This is best for shoppers who want a reliable solution without overcomplicating their choice. It’s worth adding to your shortlist if its size, features, warranty, and recent buyer feedback match your upgrade plans.
✅ Pros
- Enhances shift quality for better driving experience.
- Supports higher horsepower applications.
- Increases transmission longevity.
❌ Cons
- No customer ratings available.
- Price not listed may hinder purchasing decisions.
- Installation may require professional assistance.
💬 Our Take
The Performance EPC Blocker is a valuable addition for those looking to enhance transmission performance, especially for heavy towing situations.
Billet Compressor Wheel for 6.6l Duramax L5P 2017-21 Chevy G
| Compatibility | 2017-2021 Chevy GMC |
| Construction | Billet design for enhanced performance |
| Benefits | Improved turbo airflow |
What We Found
The Billet Compressor Wheel for 6.6L Duramax is designed for enhanced turbo performance. Though specific features are not listed, its construction likely aims to improve airflow and efficiency. It is compatible with 2017-2021 Chevy and GMC models.
Who It’s For
This product is great for those wanting a reliable upgrade without complicating their choice. Add it to your list if the size, features, warranty, and buyer feedback fit into your usage plans.
✅ Pros
- Enhances turbo performance.
- Billet design improves durability.
- Compatible with specific L5P models.
❌ Cons
- Lacks detailed feature information.
- No customer ratings available.
- Price not listed may deter buyers.
💬 Our Take
The Billet Compressor Wheel presents a potential performance upgrade, but additional details would enhance its appeal.
BILLET HIGH PERFORMANCE INPUT SHAFT – ALLISON 1000/GM TRANSM
| Compatibility | Allison 1000/GM starting in 2017 |
| Features | Performance billet construction |
| Benefits | Enhanced durability and performance |
What We Found
The Billet High-Performance Input Shaft for Allison 1000/GM Transmission boosts durability and performance for L5P models. This upgrade aims to enhance the transmission’s capabilities, especially under high-torque applications. While specific features are limited, it suggests significant performance benefits.
Who It’s For
This is ideal for L5P Duramax owners focused on improving transmission reliability and performance when carrying heavy loads. It’s a great option for those looking to maximize their towing capabilities.
✅ Pros
- Strengthens transmission for high-torque applications.
- Durable construction enhances reliability.
- Ideal for towing and heavy-duty use.
❌ Cons
- No customer ratings available.
- Price not listed may hinder decision-making.
- Limited information on installation process.
💬 Our Take
The Billet High-Performance Input Shaft offers substantial enhancements for the transmission, making it an appealing choice for heavy-duty applications.
What to Look For Before Buying
When it comes to selecting upgrades for your L5P Duramax, I recommend focusing on performance, durability, and how well they match your specific vehicle. Look for products that enhance engine efficiency and are built to handle heavy-duty use. It’s also wise to research installation needs and warranty options, as these can help you make informed choices.
Check Evaluate Compatibility
First and foremost, check that the upgrade is compatible with your specific L5P model and year. Make sure to review manufacturer specifications and part numbers to avoid any fitment issues. Getting the right fit is key for optimal performance and hassle-free installation.
Value Assess Performance Benefits
Look for upgrades that offer tangible performance improvements. Seek out enhancements in fuel efficiency, power output, or cooling capabilities. Prioritize products that can demonstrate real-world benefits based on your driving habits.
Rating Consider Customer Feedback
Don’t skip the customer ratings and feedback before you buy. Positive reviews can suggest reliability and effectiveness, while any common concerns mentioned by users should be taken into account.
Verify Check Warranty and Support
Always review warranty details and customer support options. A solid warranty offers peace of mind regarding product durability, and it’s important to ensure the manufacturer provides adequate support for installation or troubleshooting.
Frequently Asked Questions
What are the best upgrades for L5P Duramax engines?
Some of the best upgrades include fuel filter kits, boost tubes, and exhaust systems. These products are known to enhance performance, efficiency, and overall reliability.
How do I install these upgrades?
Most upgrades are designed for straightforward installation. However, it’s a good idea to consult the product manual or seek professional help for more complex setups.
Are these upgrades suitable for towing?
Absolutely, many of these upgrades are crafted to improve performance in towing situations. Products that enhance cooling and fuel delivery are especially beneficial.
Do these upgrades void my warranty?
Some upgrades could potentially affect the manufacturer’s warranty. It’s crucial to review warranty terms and conditions before making any modifications.
How can I ensure compatibility with my vehicle?
To ensure compatibility, verify the part numbers and specifications against your vehicle’s details. Compatibility information is typically provided on the product listing.
🎯 Final Verdict
If you’re on the lookout for a top-tier fuel system upgrade, I highly recommend the Fleece Performance Fuel Filter Upgrade Kit. It provides outstanding filtration and fuel pressure monitoring features. Alternatively, consider the Banks Power Boost Tube Upgrade Kit for a significant improvement in cooling performance.
