We researched and compared the best LPG conversion kits using published industry safety standards, manufacturer specifications, and aggregated owner feedback. Our evaluation focuses on performance, durability, ease of installation, and safety compliance. Whether you are retrofitting a classic car or converting a modern daily driver, this guide will help you choose the right kit for your needs.
| Photo | Product | Score | Buy |
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Prins VSI-2 Sequential LPG Kit Top Pick Sequential multipoint injection, up to 350 HP, OBD compliant |
9.2 | 🛒 Check Price |
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BRC Sequent 24 LPG Conversion Kit Best for Performance Sequential multipoint injection, up to 400 HP, CE certified |
8.9 | 🛒 Check Price |
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OMVL Dream XXL LPG Conversion Kit Best Value Sequential injection, up to 200 HP, 4-cylinder engines |
8.6 | 🛒 Check Price |
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Vialle LPdi LPG Direct Injection Kit Best for Direct Injection Direct injection system, for GDI engines, up to 300 HP |
8.4 | 🛒 Check Price |
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Bigas Pegaso N Sequential LPG Kit Good for DIY Sequential injection, up to 180 HP, 4-cylinder, DIY-friendly |
8.1 | 🛒 Check Price |
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Stag 300-6 LPG Conversion Kit Versatile Option Sequential injection, up to 250 HP, for 4-6 cylinder engines |
7.8 | 🛒 Check Price |
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Romano LPG Conversion Kit Budget Pick Single-point injection, up to 150 HP, carburetor or TBI engines |
7.3 | 🛒 Check Price |
1. Prins VSI-2 Sequential LPG Kit: Top Pick
The Prins VSI-2 stands out in our evaluation for its robust engineering and consistent performance. Based on owner feedback and the spec sheets, it delivers near-OEM driveability with minimal power loss. The kit includes a durable vaporizer and injectors that resist clogging, even with lower-quality LPG. It is also fully OBD compliant, making it suitable for modern vehicles with complex emission systems.
However, this kit is not for everyone. Its premium components come at a higher price point, and installation requires professional expertise. If you are on a tight budget or plan to install the kit yourself without prior experience, you may find the Prins VSI-2 overly complex and expensive. We recommend it for owners of high-performance or newer vehicles who prioritize long-term reliability and seamless integration.
- Advanced sequential injection for precise fuel metering and minimal power loss.
- High-quality vaporizer and injectors designed for long service life.
- Fully OBD-II compliant with integrated diagnostic capabilities.
Pros: Excellent build quality and reliability.; Smooth performance with minimal maintenance.
Cons: Higher initial investment compared to budget kits.
2. BRC Sequent 24 LPG Conversion Kit: Best for Performance
In our research, the BRC Sequent 24 impressed us with its ability to handle high-horsepower engines without sacrificing performance. Owner feedback highlights its smooth throttle response and reliable cold starts. The kit comes with a comprehensive software suite that allows precise tuning, which is a boon for performance enthusiasts. Safety certifications add to its credibility.
That said, the BRC kit demands a skilled installer to unlock its full potential. If you are not willing to invest in professional tuning, you may not achieve the advertised performance. Additionally, some users reported that the injectors can be sensitive to fuel quality. We suggest this kit for owners of modified or high-output vehicles who have access to experienced LPG technicians.
- Supports engines up to 400 HP with sequential injection for optimal power.
- CE certified vaporizer and injectors ensure safety and durability.
- Includes software for professional calibration and tuning.
Pros: High power handling capability.; Good after-sales support and calibration tools.
Cons: May require professional tuning for best results.
3. OMVL Dream XXL LPG Conversion Kit: Best Value
The OMVL Dream XXL offers a compelling balance of cost and capability. In our comparison, it provides reliable sequential injection for typical 4-cylinder commuter cars. Owner feedback indicates that once properly tuned, it delivers consistent fuel economy and smooth operation. The compact vaporizer is a plus for vehicles with limited space.
However, this kit is not designed for large or high-performance engines. Users have reported that the injectors may struggle with sustained high loads. Also, the documentation could be clearer for first-time installers. We recommend the Dream XXL for budget-conscious owners of standard 4-cylinder vehicles who are comfortable with basic mechanical work.
- Affordable sequential injection kit for 4-cylinder engines up to 200 HP.
- Compact vaporizer design simplifies installation in tight engine bays.
- Good overall reliability based on aggregated owner reviews.
Pros: Excellent price-to-performance ratio.; Easy to install for experienced DIYers.
Cons: Limited to smaller engines; not suitable for high-performance builds.
4. Vialle LPdi LPG Direct Injection Kit: Best for Direct Injection
The Vialle LPdi is a niche product that addresses the challenge of converting GDI engines to LPG. Based on manufacturer specs and owner feedback, it effectively delivers LPG directly into the combustion chamber while providing valve lubrication. This helps prevent the common issue of carbon deposits associated with GDI engines running on gasoline.
On the downside, this kit is significantly more expensive than conventional sequential kits, and installation is not for the faint of heart. Only certified Vialle installers can guarantee proper function and warranty. If you do not own a GDI vehicle, this kit is unnecessary. For owners of modern direct-injection cars who want to run LPG, it is the best option available.
- Specifically designed for gasoline direct injection (GDI) engines.
- Proprietary injectors withstand high pressure and temperature.
- Integrated lubrication system to protect valve seats.
Pros: Enables LPG conversion on modern GDI engines.; Reduces carbon buildup compared to gasoline operation.
Cons: Complex installation requires specialized knowledge.
5. Bigas Pegaso N Sequential LPG Kit: Good for DIY
The Bigas Pegaso N is a popular choice among DIY enthusiasts. Our research shows that its straightforward installation process and comprehensive manual make it accessible for those with moderate mechanical skills. Owner feedback highlights that the kit runs reliably once properly set up, and the included software allows basic adjustments.
However, some users have reported that the vaporizer and injectors may not last as long as higher-end counterparts, especially in colder climates. The kit also lacks advanced features like automatic calibration. We recommend the Pegaso N for budget-minded DIYers who are willing to invest time in tuning and accept a shorter lifespan.
- User-friendly design with color-coded wiring and clear instructions.
- Includes basic tuning software for laptop calibration.
- Good support from online communities and forums.
Pros: Relatively easy to install for mechanically inclined users.; Good community support for troubleshooting.
Cons: Build quality is not as high as premium brands.
6. Stag 300-6 LPG Conversion Kit: Versatile Option
The Stag 300-6 offers a versatile solution for a range of engine configurations. In our evaluation, it provides adequate performance for most mid-sized vehicles. Owner feedback indicates that the adjustable reducer is handy for tuning in varying temperatures, and the kit generally works well when installed correctly.
However, we found that durability can be a concern. Some owners reported early failures of the reducer or injectors, and the instructions are not as clear as they could be. Safety certifications are also less prominent compared to top-tier brands. We suggest this kit for those who have a good understanding of LPG systems and are comfortable with potential troubleshooting.
- Supports both 4 and 6 cylinder engines up to 250 HP.
- Adjustable reducer for different climate conditions.
- Includes basic wiring harness and sensors.
Pros: Good engine compatibility range.; Adjustable reducer adds flexibility.
Cons: Inconsistent quality control reported by some users.
7. Romano LPG Conversion Kit: Budget Pick
The Romano LPG Conversion Kit is the most budget-friendly option we evaluated. It is designed for older vehicles with carburetors or throttle-body injection. Based on owner feedback, it can be installed with basic tools and gets the job done for low-horsepower applications.
However, this kit uses outdated single-point injection technology, which results in noticeable power loss and worse fuel economy compared to sequential systems. Safety features are minimal, and it may not meet current emission standards. We only recommend this kit for vintage car enthusiasts who want to run LPG occasionally and are not concerned about performance or efficiency.
- Simple single-point design for older carbureted or TBI engines.
- Low cost makes it accessible for classic car conversions.
- Basic components with minimal electronics.
Pros: Very affordable entry into LPG conversion.; Easy to install on older vehicles with simple fuel systems.
Cons: Obsolete technology; poor fuel economy and power loss.
Frequently Asked Questions
What is the difference between sequential and single-point LPG kits?
Sequential injection kits deliver LPG individually to each cylinder, similar to modern gasoline fuel injection. This provides better performance, fuel economy, and emissions. Single-point kits inject LPG into a central point before the throttle body, which is simpler but less efficient and causes more power loss. For most modern vehicles, sequential kits are recommended.
Can I install an LPG conversion kit myself?
While some DIY-friendly kits exist, LPG conversion involves high-pressure gas lines and electrical connections. Improper installation can lead to leaks, fire, or engine damage. We recommend professional installation by a certified LPG technician, especially for sequential kits. If you have advanced mechanical skills, start with a kit known for clear instructions and community support.
Will an LPG conversion void my car's warranty?
In many cases, yes. Aftermarket modifications can void the manufacturer’s warranty, especially if the conversion is not approved by the automaker. Some manufacturers offer factory LPG options. Check your warranty terms before proceeding. If you have a new car, consider a certified conversion from a brand that provides a warranty on the kit and installation.
How much does an LPG conversion kit cost?
Prices vary widely based on technology and brand. Single-point kits are the cheapest, while sequential and direct-injection kits are more expensive. Installation costs add to the total. We do not quote specific prices in this guide, but you can expect to pay a few hundred to over a thousand dollars for the kit alone. Factor in professional installation and potential tuning costs.
Is it safe to convert my car to LPG?
When installed correctly using certified components, LPG systems are safe. Modern kits include safety features such as excess flow valves, thermal fuses, and leak detection. Ensure the kit meets local regulations (e.g., ECE R67 or similar). Regular maintenance and inspection are important. Avoid cheap, uncertified kits that may lack proper safety features.
Our Verdict
After thorough research and comparison, the Prins VSI-2 Sequential LPG Kit earns our top pick for its exceptional build quality, reliable performance, and OBD compliance. For those seeking a balance of value and performance, the OMVL Dream XXL is our runner-up, offering reliable sequential injection at a more accessible price point.
