Best Aftermarket EFI Systems: Optimum Power and Efficient Fuel Delivery

These top aftermarket EFI systems will provide optimum power and efficient fuel delivery for your vehicle

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  • Product Network

    17 Products

  • Clock

    14 Hours

  • Reviews

    12 Reviews

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PUBLISHED ON February 12, 2020

EFI (electronic fuel injection) systems are becoming more and more popular because of their efficiency and optimum power. Compared to carbureted motors, they are great because they deliver better fuel economy. Many people think that conversion from carburetor to EFI is a really difficult task, but it is not as hard as it sounds. If you know which system is best suited for your needs, then you will be able to make an informed decision. Our top picks for the best aftermarket EFI system are outlined in the guide below.

  • Best Overall
    Holley 550510K Sniper EFI Master Kit Shiny
    With a fuel pressure of 58.5 PSI, this Holley 550-510K Sniper EFI kit comes with everything you need for installation of the system.
    It includes 20 feet of EFI hose and an in-line fuel pump for easy installation. It also includes pre fuel filters along with the necessary hardware.
    Installation is a bit tricky. Therefore, decent mechanical abilities are required for installation.
  • Best Value
    Holley 550510 Electronic Fuel Injection
    With a weight of only 9.02 pounds, this Holley 550510 Electronic Fuel Injection can support up to 650 HP. It also includes a self-tuning ECU.
    It includes dual pattern bolt on carburetor replacement. It features an easy-to-use self-tuning system. It also includes easy-to-replace oxygen sensors.
    You cannot run dual carbs on this system.  Assembling the kit requires automotive knowledge.
  • Honorable Mention
    MSD 2900 Atomic EFI Master Kit
    Weighing only 16.14 pounds, the MSD 2900 Atomic EFI Master kit can easily fit multiple models.
    It includes single fuel line self-tuning and built-in sensors.  There is no need for bulky ECU. It has only eight wirings. A laptop is not needed for programming.
    Battery charger needs to be plugged in for a long time. The computer tends to drain the battery faster.

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  • If you are planning to use a power adder (such as a supercharger) with your EFI system, you should consider a system that is compatible with your power adder.
  • If your engine is a new build, consider consulting with an engine-building professional before installing an EFI system.
  • EFI systems require higher fuel pressure for efficient operation. Therefore, you should consider upgrading the fuel line to meet the EFI system requirements.
  • Usually, EFI systems do not include a fuel reservoir as compared to a carburetor that has bowls for fuel storage. Therefore, you should also consider installing a fuel tank designed for EFI systems.
  • The location of the fuel pump is very important because it cannot stand higher temperatures for a longer time. Make sure to mount it in a location where it can easily cool down.


Q: How does an aftermarket EFI system work?

A: An aftermarket EFI system uses high-pressure fuel delivery to an injector. It also uses computer controls, and overall it increases the power and fuel efficiency of a vehicle. The whole system is controlled electronically.

Q: What do I need to install an aftermarket EFI system?

A: You will need throttle bodies, a suitable manifold, a fuel pump with high pressure, injectors, and a filter. Apart from this, you will also need a regulator, a fuel rail kit, ECU, and a return line to the fuel cell.

Q: Do I need to use air cleaners on an EFI system?

A: Yes, we recommend you use cleaners. Any standard aftermarket cleaner can be used.

Final Thoughts

Our pick for the best overall aftermarket EFI system is the Holley 550510K Sniper EFI Master Kit Shiny because it provides a great deal of functionality. It contains a complete fuel system and can be used on almost any kind of carbureted vehicle. However, if you want to consider a budget-friendly option, you should consider the Holley 550510 Electronic Fuel Injection.