Best Injectors For 5.9 Cummins (1994-2007)

We are willing to bet you have probably never considered upgrading your truck’s fuel injection system – you have most likely just always considered it an essential part of your engine, not something to play with. But did you know upgrades to stock fuel injectors can make your truck more powerful and more fuel efficient? Read on to learn more about these super cool products!

Comparison of the Best 5.9L Cummins Injectors

IMAGEPRODUCT
  • Rebuilt & Tested using OEM Bosch equipment
  • Stock power or up to +160HP options
  • Copper washers and new o-rings included
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  • Will boost your engine’s miles per gallon
  • Comes with a one year unlimited warranty
  • Arrives with washers and o-rings for installation
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  • Able to boost both engine power and efficiency
  • Included installation/removal tool makes set up easy
  • De-burred orifices will enhance flow and atomization
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  • Has a one year unlimited mileage warranty
  • Comes with washers for quick and easy installation
  • Sold individually, so no requirement to purchase a full set
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  • Easy to install and easy to use
  • Produces a large amount of increased power
  • Sold individually, so will not need to purchase a set
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  • Has a one year unlimited mileage warranty
  • Will address an engine that misfires randomly
  • Comes with o-rings and copper crush washers for installation
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  • Will boost your truck’s horsepower by 120
  • Comes with a two year unlimited warranty
  • Product is specifically designed for use when racing
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  • Does not produce any rattling or smoky haze
  • Injector set comes with a calibration summary
  • Injectors have unlimited nozzle flow increases for maximum power
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What is the Purpose of an Injector?

An injector is responsible for doing just that: injecting! The injector is the component of your truck’s engine that actually supplies your car with fuel, as it injects fuel from the tank into the engine cylinders.  Enhanced injection systems, such as the ones described in this article, can improve this process so that your truck is enabled with more power and even increased fuel economy as well. Some injectors can turn a tired old engine into a total beast!

How to Choose Injectors for a 5.9L Cummins

Injectors have a number of key attributes you should consider before purchasing. Here are some of the most important:

Increased Horsepower

Odds are, if you are interested in an injector beyond the stock system that comes with your vehicle, you are intrigued by the possibility of a more powerful truck. With that in mind, you should definitely look at how much horsepower a particular injector system will enable your engine to reach.

Ease of Installation

Installing an injector system is not exactly like replacing your windshield wiper fluid – injectors are an integral component of your engine and your truck literally will not be able to function if they are not installed properly. So make sure you find yourself a system that is straightforward and relatively simple to set up.

Fuel Economy

The best injectors will streamline the process of injecting fuel into your engine in such a manner that your engine will ultimately require less fuel to reach new heights of power. Make sure you find yourself an injector that can do this for your vehicle and save you a few dollars.

Top 3 Models - Best 5.9L Cummins Injectors

Review of the Best 5.9L Cummins Injectors

So now that you have a bit more familiarity with the concept of injectors, check out some of our top injector picks:

PROS

  • Boosts truck’s power
  • Will increase fuel economy
  • Has multiple performance levels
  • Has a one year unlimited warranty
  • Industrial Injection provides good customer service

PROS

  • Will increase your truck’s emissions

The Industrial Injection Remanufactured Performance Injector is a fantastic injector that will bring your truck to a level even higher than it was at when you first bought it! Forget waking your truck up – how about feeling like you are driving a whole new vehicle? Industrial Injection will provide all that and more for you with their Remanufactured Performance Injector.

This injector will boost your engine’s miles per gallon by up to three miles, and will make your truck engine run more smoothly for an additional 250,000 miles. It comes with everything you could possibly need for installation, including washers and O-rings, so you will not need to be stressed out at all during the set up process. And if anything does somehow go wrong with that situation, you will not need to worry – Industrial Injections sells their products with a one year unlimited warranty, so you can always return your injector right away.

Bottom Line

The Industrial Injection Remanufactured Performance Injector is a great injector that will take your truck to new heights in terms of power and fuel efficiency. It will increase your truck’s emissions, though.

PROS

  • Will boost fuel economy
  • Injector is flow enhanced
  • Has de-burred orifices to increase fuel flow and atomization
  • Comes with an installation/removal tool so that you will easily be able to set the system up yourself

PROS

  • Hose in kit is prone to leaking

The BD Diesel Injector Kit (100hp) is one of the most reliable injector products you will be able to find on the market today. BD has been producing automotive parts for almost fifty years, so you know that when you go with them, you are purchasing a high quality product that has been tried and tested.

These injectors are no different. BD will actually offer you the opportunity to send your old injectors in for testing so that they will be able to recommend a product that is best for your specific vehicle’s engine. And if you choose to go with the 100 horsepower boost, oh baby, watch out! These injectors will take your truck to new heights when it comes to engine power and efficiency.

Bottom Line

The BD Diesel Injector Kit (100hp) is a fantastic injector system from a tried and true, reliable automotive brand that will revolutionize your truck’s capabilities. Watch out for the kit’s hose, though – it may need patching.  

PROS

  • Will increase your truck’s power
  • Sold individually, not as a full set
  • Come with washers for easy installation
  • Industrial Injection provides great customer service
  • Come in a variety of different levels: race levels 1-8

PROS

  • Will increase your truck’s emissions
  • Injectors at Race level 4 and higher will require vehicle modifications

The Industrial Injection Race / Dragon Flow Injectors are a set of injectors that will be able to take your truck to the next level – literally! These injectors are sold in a variety of different levels so that you can specifically choose what would work best for your truck and your needs as a driver. The Race Levels of these injectors start at 1 and go up to 8, with any level higher than 4 requiring some truck modifications beyond the stock engine. Being able to choose at what level you would like your truck to increase its power to is an option not provided by any other manufacturer on this list! As a bonus, these injectors are easy to install and will not cause a complicated process that will result in frustration. If you want an option that you can fully customize to your specific truck, you need to go with the Industrial Injection Race / Dragon Flow Injectors!

Bottom Line

The Industrial Injection Race / Dragon Flow Injectors are a great set of injectors with levels that you can set, depending on how much more power you want your truck to have. Some levels will require vehicle modifications, though.    

PROS

  • Can tow light loads
  • Boosts truck horsepower by 120
  • Specifically designed for race use
  • Has a two year unlimited warranty

PROS

  • Need to fill out a race waiver to buy
  • Will significantly increase your truck’s emissions
  • Product installation may void your truck’s warranty

It is true that on face value, there may be many more cons than pros to investing in he Dynomite Diesel Products Injector SET – 120 HP. You will need to fill out a race waiver in order to purchase these injectors from most manufacturers. There are many states that have banned the sale of these injectors entirely, and many more states that do not allow vehicles with these injectors to drive on public roads and restrict the trucks with this system to off-road or race locations instead.

And, installation of this product is entirely manual and will more likely than not entirely void your truck’s warranty (if the warranty is even still active on a truck of that age).

All of this to say…if you are looking for the biggest, baddest injectors on the market, you will not be able to find one better that the Dynomite Diesel Products Injector SET. These injectors will boost your truck’s horsepower by 120 and produce a noticeable smoke haze while you are revving your engine. If you have always wanted to drive the most intimidating truck on the road, these injectors are the best choice for you.

Bottom Line

The Dynomite Diesel Products Injector SET – 120 HP is a monster of a injector system that will turn your truck into a total beast. It does have some inconvenience features though, like needing to fill out a race waiver before you buy.  

PROS

  • Injectors will run smoothly
  • Comes with a calibration summary
  • Has unlimited nozzle flow increases
  • Exergy provides fantastic customer service
  • Will not produce any rattling or smoky haze

PROS

  • Will not pass a California smog check 

If you are looking for the most reliable, guaranteed to be high functioning injectors available on the market today, look no further than the Exergy Injectors (Set of 6). Exergy has taken a number of steps to ensure their products are the absolute best. These include measuring and correcting their injector sets for proper operation at all power ranges, from idling all the way up to maximum power.

When you buy an injector set from Exergy, you know your injector system will always be performing at its absolute best. And you know that such performance will always be consistent: Exergy Injectors have all been balanced within 4% of each other, so every time you choose an Exergy Injector you can expect the same standard of excellence.

Additionally, Exergy will go the extra mile for their customers and fully map your injector set to maximize your system for your specific vehicle. There really is not much to dislike about an Exergy Injector set!

Bottom Line

The Exergy Injectors (Set of 6) are the most reliable, high quality injectors you will be able to find. But be forewarned, if you happen to live in California: they will not pass California emissions tests.  

Diesel Fuel Injector For Bosch 04-09 Dodge Ram Cummins 5.9L DIESEL 0986435505 0445120238

PROS

  • Increases truck’s fuel economy
  • Sold individually as opposed to a set
  • Bosch provides great customer service
  •  Will fix your engine misfiring randomly

PROS

  • Injectors are remanufactured

The Genuine Bosch Stock 505 Cummins Fuel Injectors are some of the most high quality fuel injectors you will be able to find. Bosch really sets the industry standard when it comes to injectors, so when you buy real Bosch injectors, you know you are investing in a quality product. Bosch provides a number of convenience features with these injectors, including shipping the injectors with O-rings and copper crush washers already attached, so your new injectors will be immediately ready for installation when they first arrive.

Bosch also provides a one year unlimited mileage warranty with your purchase – but you certainly will not need it, these injectors will continue to work well even after your truck has accumulated a large amount of miles. And, if there is an instance where you do need to replace a broken injector, you can go ahead and repurchase from Bosch, because they sell their injectors individually, as opposed to a set. This will save you a significant amount of money in the long run.

Bottom Line

The Genuine Bosch Stock 505 Cummins Fuel Injectors are high quality, high performance fuel injectors. They are remanufactured, but that really only applies to their outer housing.

PROS

  • Durable
  • Easy to use/install
  • Come with clear instructions
  • Bosch provides good customer service

PROS

  • Injectors are remanufactured

The Bosch 12 Valve 90 Horsepower Performance Injectors are another example of a high quality Bosch product that will make your vehicle’s engine (not to mention you!) very happy. These injectors come with all the Bosch guarantees, so you know you are investing in a product that is built to go the distance.

Bosch injectors are straightforward to install and to use, meaning you will not need to spend a large amount of time or potentially money to take your car down to the local mechanic to get these bad boys up and running. The injectors will provide noticeable boosts in power to your vehicle, bringing it up to the way it functioned when you first bought it. These injectors are particularly unique if you have made any modifications to your engine that may require increased fuel – never fear, these injectors have you covered.

Bottom Line

The Bosch 12 Valve 90 Horsepower Performance Injectors are an amazing injector investment to make, as they will really wake up your vehicle, particularly if you have made any modifications to your engine. They are remanufactured (as are many Bosch products), but they will function as if they are completely new.

How to Spot a Clogged Injector

In order to spot a clogged injector, you will need a pressure gauge and a fuel injector tester. Find your fuel pressure port on your fuel rail and remove the plastic cap. Attach your fuel pressure gauge to the port. Your truck’s manual should list the ideal pressure for your engine. Turn your engine on and observe the gauge.

It can also be helpful to cycle your engine on and off a few times to ensure you are getting an accurate reading. If your fuel pressure is not ideal, it could very well be because of a clogged injector.

Connect your fuel injector tester to the fuse box system. Use the tester to send a pulse, and measure the impact on your pressure gauge. Do this with all of your fuel injectors – if one has a noticeably different impact on the gauge, that one is likely clogged. Check out the video below for a more in-depth overview of what was just described.

Conclusion

Fuel injectors can take a tired old engine and breathe new life and power into it – in some cases, maybe taking it to a level where it isn’t even street legal to drive anymore! Whatever your desire for your engine, whether it is turning it into a beast or just giving it a little more oomph, a fuel injector can help you get there.