Put Cold-Start Troubles Behind You: Best Aftermarket EFI Systems

EFI systems are nothing new to the aftermarket, and if you're a classic car nut like myself and other members of The Drive's team, you spend a lot of time reading about them. Even if they aren't on our personal cars, they're something that we know more than enough about to help you decide which belongs on your car. That doesn't mean we view our minds as the only source of information. To ensure we put together a list of recommendations and buying guides that are truly useful to you, we take the time to research the latest offerings from leading manufacturers as well as many customer reviews to find out which are the best EFI systems on the market. 

Holley's Sniper EFI system is a great option for many, but it's not the best for every situation. Your build and personal preferences might require something else. That's why we included a list of alternative options below. 

There's a lot to consider before you jump on the first EFI system you come across. Namely that, even if modern EFI systems are easier to install than ever, there's more to think about than just the tools you'll need to bolt one on. Here are a few tips that will help you make an educated choice on which works best for you. 

There are two primary types of EFI systems you can choose from. The first and most-likely choice is throttle body injection (TBI). These are the most simple and affordable types out there. This type works by placing the fuel injectors in the throttle body, creating a situation where a controlled mixture of fuel and air is pulled through the manifold. It works much like a carburetor, and you can even find some kits designed to look like a 4150 carb, but offer better control over fuel mixtures. Multiport injection is the other option. This features a throttle body, but it controls little more than airflow to the manifold. The fuel injectors are moved down the intake runners just before each of the cylinders. This is a far more precise system that is ideal for optimal performance, but they are a lot more expensive than TBI systems.

Fuel injection systems are unlike carburetors in that they give you a set horsepower range they're designed to work with as opposed to a CFM rating. This makes selection pretty self-explanatory, but it is essential to be honest with yourself and pick a kit that is a true match for your application for the best experience. 

Multiport injection systems typically come with replacement intake manifolds, so those buyers  just need to ensure they pick the right fit for their engine. TBI systems, while semi-universal, require a little bit of homework before purchasing. In order to pick the right system, you must ensure its mounting-type is a match to your existing manifold. Manufacturers offer kits to work with single, two, and 4-barrel setups. If you're working with a 4-barrel, be sure that the kit will work with your 4150 or spread bore application – some work with both. Of course, multi-carb-type systems are also available for dual quad and 6-pack-style systems. If you can’t find a system that matches your existing manifold, you may need to swap manifolds to make the upgrade. 

EFI systems alone usually cost anywhere from around $900 to $3000. A basic TBI system will usually exist at the lower end of the scale, while multiport systems dominate the top half. That price likely won’t cover everything, though. In most cases, you’ll need to invest in a fuel system to work with EFI, along with charging system and ignition upgrades to further drive up the overall investment. 

You've got questions. The Drive has answers.