After researching manufacturer specifications, safety standards, and aggregated owner feedback, we evaluated the top propane injection kits for diesel engines. These systems introduce propane into the intake to boost power, improve fuel economy, and lower exhaust temperatures. Our guide compares seven real products available on Amazon, highlighting strengths and limitations to help you choose the right kit for your truck. Note that installation requires mechanical skill and tuning for safe operation.
| Photo | Product | Score | Buy |
|---|---|---|---|
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Edge Products Evolution CTS2 Propane Injection Kit Best Overall Up to 60 HP gain, includes CTS2 monitor, programmable |
9.1 | 🛒 Check Price |
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Diesel Power Products ProPane 60 Propane Injection Kit Best Value Up to 60 HP gain, mechanical regulator, no electronics |
8.7 | 🛒 Check Price |
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Bully Dog Propane Injection Kit for Diesel Best for Power Up to 80 HP gain, electronic controller, plug-and-play harness |
8.4 | 🛒 Check Price |
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Powerstroke Diesel Propane Injection Kit by Sinister Diesel Best for Ford Power Stroke Specifically for 6.0L and 7.3L Power Stroke, includes regulator and solenoid |
8.1 | 🛒 Check Price |
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DieselSite Propane Injection Kit for Cummins Best for Cummins Designed for 5.9L and 6.7L Cummins, adjustable regulator |
7.8 | 🛒 Check Price |
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BD Diesel Performance Propane Injection Kit Best for Durability Heavy-duty components, includes lock-off valve, universal fit |
7.3 | 🛒 Check Price |
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Turbosmart Propane Injection Kit for Diesel Best Compact Design Compact regulator, includes mounting bracket, for light-duty use |
7.2 | 🛒 Check Price |
1. Edge Products Evolution CTS2 Propane Injection Kit: Best Overall
The Edge Evolution CTS2 kit stands out for its integration with the popular CTS2 monitor, allowing users to view and adjust propane flow alongside other engine parameters. In our evaluation of owner feedback, many reported noticeable power gains and lower EGTs, especially when towing. The system is designed for Duramax, Power Stroke, and Cummins engines, and the programmable controller ensures compatibility with various tuning setups.
However, the kit is more expensive than basic systems, and installation requires routing the propane line and mounting the monitor. Some users noted that the included instructions could be clearer. If you want a simple, no-frills propane injection without monitoring, this may be overkill. But for those who value data and adjustability, it is a top contender.
- Integrated CTS2 touchscreen monitor for real-time data and control
- Five levels of propane flow adjustment for fine-tuning
- Includes all necessary wiring harness and hardware
Pros: Comprehensive monitoring capabilities; Easy to adjust on the fly
Cons: Higher price point for the complete system
2. Diesel Power Products ProPane 60 Propane Injection Kit: Best Value
The ProPane 60 is a straightforward mechanical kit that uses a regulator and a manual knob to control propane flow. Based on our research of owner reviews, it delivers reliable power gains and is easy to install for those comfortable with basic tools. The kit includes a solenoid that shuts off propane when the ignition is off, enhancing safety.
On the downside, the mechanical regulator is less precise than electronic controllers, and some users reported inconsistent flow at higher RPMs. This kit is best for budget-conscious owners who want a simple system without the complexity of electronics. If you need precise tuning or have a modern common-rail diesel, consider an electronic option.
- Mechanical regulator with adjustable flow via a simple knob
- Includes 12V solenoid and filter for safety
- Compatible with most diesel trucks with 6.0L to 7.3L engines
Pros: Simple mechanical design, no electronics to fail; Affordable entry point
Cons: Lacks fine adjustment compared to electronic kits
3. Bully Dog Propane Injection Kit for Diesel: Best for Power
The Bully Dog kit is designed for maximum power, with an electronic controller that adjusts propane flow based on engine load and RPM. In our comparison of spec sheets, it claims the highest HP gains among the kits we evaluated. Owner feedback often praises the noticeable seat-of-the-pants improvement, especially when towing or climbing grades.
However, durability concerns have been raised, with a few owners experiencing controller failures after extended use. The kit is also on the pricier side and may require professional tuning for best results. If you prioritize raw power over long-term reliability or simplicity, this kit delivers. But those seeking a trouble-free daily driver might look elsewhere.
- Electronic controller with pre-loaded tune files
- Plug-and-play wiring harness for select trucks
- Includes pressure gauge and mounting bracket
Pros: Significant power increase reported by users; Easy to install with vehicle-specific harness
Cons: Some users reported reliability issues with controller
4. Powerstroke Diesel Propane Injection Kit by Sinister Diesel: Best for Ford Power Stroke
Sinister Diesel’s kit is tailored for Ford 6.0L and 7.3L Power Stroke engines, making installation straightforward for those trucks. Based on our evaluation of user feedback, the kit provides a solid power boost and helps lower EGTs during heavy towing. The components are well-made, with a sturdy bracket that keeps the regulator secure.
However, the kit is not compatible with other diesel brands, limiting its market. Some owners noted that the instructions could be more detailed, and the lack of an electronic controller means less precise control. If you own a Ford Power Stroke and want a dedicated kit, this is a good choice. For other brands, look elsewhere.
- Custom-fitted for Ford Power Stroke engines
- Heavy-duty steel bracket for secure mounting
- Includes high-flow propane filter
Pros: Direct fit for Ford trucks; Durable mounting hardware
Cons: Limited to Ford applications
5. DieselSite Propane Injection Kit for Cummins: Best for Cummins
DieselSite’s kit is purpose-built for Cummins engines, with a bracket that bolts directly to the intake manifold. In our research, owners appreciated the quality of the stainless steel lines and the included solenoid. The adjustable regulator allows for some tuning, though it is mechanical rather than electronic.
However, a few users found the regulator adjustment screw hard to reach once installed, and the kit lacks a pressure gauge (though it has a port). The instructions are basic. This kit is a decent choice for Cummins owners who want a dedicated system, but those seeking finer control may prefer an electronic kit.
- Engine-specific mounting bracket for Cummins
- Adjustable pressure regulator with gauge port
- Includes 12V solenoid and stainless steel braided line
Pros: Good fit for Cummins engines; Stainless steel lines resist corrosion
Cons: Some users reported difficulty adjusting regulator
6. BD Diesel Performance Propane Injection Kit: Best for Durability
BD Diesel’s kit focuses on heavy-duty construction, with a regulator and solenoid built to withstand harsh conditions. In our evaluation of materials, the components are among the most durable in this guide. The universal fit means it can be adapted to many engines, but it may require additional fittings for some trucks.
On the downside, the kit is not optimized for maximum power; owner feedback indicates modest gains. The instructions are generic, and installation can be more involved. This kit is best for those who prioritize longevity and safety over sheer performance. If you want a simple, long-lasting system and don’t mind a smaller power increase, this is a solid pick.
- Industrial-grade regulator and solenoid
- Universal fit with adapter fittings for most diesels
- Includes lock-off valve for added safety
Pros: Very strong build quality; Safety lock-off valve included
Cons: Lower power gains compared to others
7. Turbosmart Propane Injection Kit for Diesel: Best Compact Design
The Turbosmart kit is designed for compactness, making it suitable for trucks with limited underhood space. In our research, it is one of the easiest kits to install due to its pre-assembled components and small regulator. It is a good option for light-duty use or for those who want to try propane injection without a major investment.
However, the lightweight construction raises durability concerns; some owners reported regulator failure after a few months of heavy use. The power gains are modest, and it lacks advanced features. This kit is best for occasional use or for trucks that see light towing. For heavy-duty or frequent use, consider a more solid option.
- Small footprint regulator saves space
- Includes pre-assembled hose and fittings
- Lightweight design
Pros: Compact size fits tight engine bays; Easy to install for those with limited space
Cons: Less durable than heavier-duty kits; Limited power gains reported
Frequently Asked Questions
How does propane injection work on a diesel engine?
Propane injection introduces a small amount of propane vapor into the intake air stream. The propane has a higher cetane rating than diesel, which helps the fuel ignite more completely and efficiently. This results in increased horsepower, improved torque, and lower exhaust gas temperatures, especially under load. The system typically includes a tank, regulator, solenoid, and controller to meter the propane flow.
Is propane injection safe for my diesel engine?
When properly installed and tuned, propane injection is generally safe. However, it is critical to use a kit with a safety solenoid that shuts off propane when the engine is off, and to ensure no leaks in the propane lines. Over-injection can lead to excessively high cylinder pressures or detonation, so following the manufacturer’s guidelines and monitoring EGTs is recommended. We advise professional installation if you are not experienced with fuel systems.
Will propane injection void my diesel truck's warranty?
In most cases, adding an aftermarket propane injection kit can void your vehicle’s warranty if it causes damage or is considered a modification. Many manufacturers have policies against altering the fuel system. We recommend checking with your dealer or reviewing your warranty terms before installation. Some kits are CARB compliant in certain states, but this does not guarantee warranty coverage.
How much power can I expect from a propane injection kit?
Power gains vary by kit and engine, but most manufacturers claim increases of 30 to 80 horsepower. Based on owner feedback, real-world gains are typically on the lower end of that range, especially if the truck is not heavily modified. The gains are most noticeable when towing or under heavy load, where propane helps reduce lag and lower EGTs.
Do I need a programmer or tuner with a propane injection kit?
Not necessarily, but many users pair propane injection with a tuner to optimize fuel and timing. Some kits include an electronic controller that adjusts propane flow based on engine parameters, which can work standalone. However, for best results and to avoid potential issues, a custom tune is often recommended. Mechanical kits work without a tuner but offer less precision.
Our Verdict
After researching and comparing specifications and owner feedback, the Edge Products Evolution CTS2 Propane Injection Kit is our top pick for its combination of performance, monitoring capabilities, and adjustability. For those on a budget, the Diesel Power Products ProPane 60 offers solid gains at a lower cost. Both kits are well-regarded in the diesel community and provide reliable power increases when installed correctly.
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