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Top 3 Best Aftermarket EFI System In 2021 Reviews

For vehicle owners, one of the top concerns is poor fuel economy. It can cost you a lot in the long run. Plus, it is highly tricky. This is where EFI systems can help. EFI stands for Electronic Fuel Injection system. It has proven to improve fuel economy.

In recent times, EFI systems have become very popular. They are admired for their efficiency and power along with other things. However, people often find converting from carburetor motor to EFI difficult and confusing. Thus, we have the complete guide to the best EFI aftermarket systems for you.

If you want to learn more about them, then keep on reading:

Top 3 Best Aftermarket EFI System In 2021 Reviews

Best Aftermarket EFI System Comparison Table

ProductsModel no.ConnectionsPowerCARB approvalRating
Model no.
650 HP
CARB approval
5 out of 5 stars (5 / 5)
Model no.
600 HP
CARB approval
4.3 out of 5 stars (4.3 / 5)
Model no.
525 HP
CARB approval
4.6 out of 5 stars (4.6 / 5)

Top 3 Best Aftermarket EFI System To Buy In 2021 Reviews

1 New Holley Sniper EFI self-tuning Kit

New Holley is known to have some of the best EFI kits. This one is also amongst their best products. It is provided in base and master kit versions. In addition, the master kit consists of a fuel kit and all needed hardware (pump, filters, brackets, bulkhead, etc.) required for the complete installation.

Above all, it carries multiple features that ensure easy operation. It has a high-resolution full-color touchscreen. This aids in initial setup, tuning, and gauge displays. Plus, its internal fuel pressure regulator completely removes the hassle of installing an external regulator. Moreover, it has an built-in timing control and coil driver.

Additionally, the clamp-on oxygen sensor kit enables a leak-free oxygen sensor installation. Plus, it overall, has a black finish and classy look. Its built is heavy-duty cast aluminum. This unit puts an end to all the cold start issues, hesitations, vapor lock, and flooding.

New Holley Sniper EFI self-tuning Kit
Our rating:5 out of 5 stars (5 / 5)


  • Eliminates Cold starts, hesitations, flooding, and vapor lock.
  • Works for muscle cars, off-road trucks, street rods, and other carbureted vehicles.
  • Includes a clamp-on oxygen sensor kit that ensures a leak-free sensor installation.
  • Easy to operate with integrated ignition timing control and coil driver.
  • Supports up to 650 HP and only requires four wiring connections.


  • Assembling the kit can be slightly tricky.
  • On the more expensive side of the spectrum.

2 Fitech Fuel Injection Go Street EFI system

If you want a simple and basic but well-designed EFI kit, then this is a great option. It carries all the basic features required. They provide excellent performance and maximum fuel economy. In addition, it is similar to many higher-end kits. However, it remains within reach to people.

Having an inline fuel pump delivery kit, this unit is suitable for engines of up to 600 HP. It carries Bolt-N-Go technology right out of the box without any tuning required. Plus, it also consists of idle air control, throttle position sensor, fuel pressure regulator, and coolant sensor.

In addition, all the fittings and hardware compulsory for the install are included in the kit. It carries a 20 ft EFI-grade fuel hose. This is suitable for both inlet and return lines between the engine and fuel tank.

Plus, a handheld controller and billet case are also a part of the kit for easy working. It features solid aluminum construction. It has an attractive cast iron finish that make it a great investment.

Fitech Fuel Injection Go Street EFI system
Our rating:4.3 out of 5 stars (4.3 / 5)


  • One of the most affordable options in the market.
  • Ready to use and comes with all fittings and hardware included.
  • Works well for Chevrolet, Pontiac, Ford, Plymouth, Chrysler, Dodge, etc. and other engines up to 600 HP.
  • Features attractive cast iron finish and solid aluminum construction.
  • Built-in pressure regulator and one BAR internal MAP sensor.


  • Doesn’t have programmable features.
  • Fuel pump is quite noisy.

3 MSD 2900 Atomic EFI Master Kit

Last but not least, this is one of the best MSD EFI kits out there. It has a highly durable and sturdy build. Overall, the look is also attractive. In addition, it is built to be flexible. It can work for multiple vehicle models. Plus, it has been approved by the California Air Resources Board (CARB).

In order to make the operation easy, it has fewer wiring links without the bulky ECU to mount. This makes conversion from carburetor to EFI super easy.

In addition, it has built-in sensors and a self-learning system. This means it can measure and analyze pressure and temperature after installation. Moreover, it doesn’t require a laptop for programming; instead, all operation is done simply by means of a simple handheld monitor.

You can simply remove the monitor once the unit is running. Or leave it plugged in to view the engine parameter in real-time.

MSD 2900 Atomic EFI Master Kit
Our rating:4.6 out of 5 stars (4.6 / 5)


  • Comes with all tools like brackets required for installation.
  • No bulky ECU to mount with fewer wiring connections than others.
  • Highly versatile and capable of fitting multiple models.
  • It comes with a limited one-year manufacturer’s warranty and is CARB approved.
  • Features self-learning technology to monitor and analyze engine operating conditions.


  • Requires automotive knowledge and experience with welding to install
  • The computer drains the battery pretty fast

Best Aftermarket EFI System Buying Guide

Buying an EFI system kit can be pretty tricky if you have little clue of what to look for. There are certain factors that need to be pondered over. Let’s take a look at them so one can get a better grip of what to look for in an aftermarket EFI system:


An EFI system can be sorted into different types. Examples being single-point, multi-point, and direct point. Each has its pros and cons and differs in terms of working.

A single-point EFI system has a single injector mounted on the throttle body. It is on the more low-cost end of the spectrum. It is easy to service as well.

aftermarket efi system

Meanwhile, multi-point systems basically have a different fuel injector for each cylinder. These tend to be more precise but more pricey.

In addition, a direct system has a direct fuel injector. This sprays fuel in the combustion chamber directly rather than directing it to the intake valve.


It’s always better to opt for a renowned and reputable brands when it comes to buying EFI system kits . Such brands are credited for making high-quality products. This will ensure that you end up with a good-quality EFI system kit. In addition, good brands tend to have consistently good-quality construction and performance.

Plus, good brands tend to have helpful tech service. They pay great attention to their customer’s ease of usage. This could be great when you need assistance with installation or operation. A few examples would be Holley, Fitech, and MSD.


Aftermarket EFI systems usually tend to cost more than $1000. Products around the $1300-$1500 mark tend to be programmable. Above all, they carry advanced features. This may not be everyone’s cup of tea.

If you are a beginner, you would much prefer a simple unit. The basic features provide a good quality performance. Do not shy away from investing in a decently priced product. Investing in low-quality units can, in turn, end up having negative effects on your vehicle.


You will come across the power output of the injector when you go through descriptions. You basically need to select an injector with horsepower matching the airflow and fuel needs of your engine. It essentially leads to good engine performance regardless of speed and driving conditions.


It’s always nice to opt for a product backed by good warranty service. It’s always better to invest in a product which has at least one-year warranty. This ensures the reliability of a product. Above all, it’s often missed, but having good tech service can be very helpful. They can aid with the install or when you have concerns about using the unit.


A lot of times, what happens is that buyers get too excited over a product and forget checking its compatibility. This is a mistake. One should always check a product’s compatibility first. Not every EFI system will work for every vehicle model. If you end up getting the wrong product, it will be a very pricey yet wasted investment.


Aftermarket EFI systems are great investments if you feel as if your vehicle’s fuel economy is bad. It may seem like a lot of work, but it’s worth the efforts in the long run. Each product is different and brings something new to the table.

However, there is one of these products that stands out and proves to be the best choice. For us, the New Holley Sniper EFI tuning Kit throws it out of the park. This is due to its highly functional nature and performance. Hopefully, this post helped you in finding the right EFI system kit for your vehicle.

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