Cummins X15 Injector Set and Fuel Tubes | 5597421

Cummins X15 EPA17, EPA21, EPA 23 Fuel Injector Set & Fuel Delivery Tubes – P/N 5597421 (NEW – No Core)

Look no further than Momentum Worx when it comes to injectors for your Cummins X15 EPA 17 engine. These are direct replacement injectors, ready to install.

The Momentum Worx 5597421 Fuel Injector Set is a complete set of 6 BRAND NEW injectors (not reman) built for operators who demand reliability, uptime, and performance. No cores. No games. No downtime.

WHY MOMENTUM WORX INJECTORS?

• ✅ Complete Set of 6 Injectors 
• ✅ Complete Set of 6 Fuel Delivery Tubes
• ✅ 100% BRAND NEW – No Remanufactured Components
• ✅ No Core Charge – Keep Your Old Parts
• ✅ Includes NEW Fuel Connector Tubes
• ✅ Tested & Thrashed – Momentum Worx Approved
• ✅ Direct Replacement for Cummins X15 EPA17, EPA21, EPA23
• ✅ Plug-and-Play Fitment – No Calibration Headaches

 You’re getting 6 brand new injectors + new connector tubes, ready to drop in and go.

And let’s be clear…
“Matched injector sets” = marketing nonsense.

What actually matters:

• Proper OE specs
• Consistent quality
• Real-world testing

That’s what we focus on. Not buzzwords.

NO B.S. WARRANTY – THE MOMENTUM WORX WAY

We don’t hide behind fine print.

1-Year No Questions Asked Replacement Warranty

If something goes wrong, we replace it. No interrogation. No runaround. No corporate nonsense.

That’s the difference between a parts counter… and a company that actually knows ball. 

BUILT FOR WORKHORSES

The Cummins X15 engine is a modern diesel powerhouse, but injectors are still a wear item.

Replacing one injector? You might get away with it.
Replacing all six? You eliminate variables and downtime.

Avoid:

• Hard starts
• Rough idle
• Power imbalance
• Repeat failures

Install a full set and keep your truck making money, not sitting in the shop.

CROSS REFERENCE PART NUMBERS

Direct replacement for the following:

209955EX
4327147
4327147NX
4327147PX
4327147RX
5579421NX
5579421PX
5579421RX
6513589
6513589PX

FITMENT

• Cummins X15 Engines (Email us your ESN if you would like 100% confirmation - Sales@momentumworx.com)

ORDER WITH CONFIDENCE

Stock is limited due to high demand on X15 components.

Upgrade your fuel system today with a complete set of 6 and experience the Momentum Worx difference.

COMMON QUESTIONS

Do these injectors require a core return?

No. These are 100% brand new injectors, not remanufactured.
No core charge and nothing to send back.

Are fuel connector tubes included?

Yes. Every set includes brand new fuel connector tubes.
 We do this to eliminate contamination and ensure a clean, proper install.

Are these genuine Cummins injectors?

No. These are direct NON OEM replacement injectors built to meet or exceed OE specifications for the Cummins X15.

Do I need to replace all 6 injectors?

You don’t have to — but it’s highly recommended.

Replacing one injector can:

• Leave uneven performance between cylinders
• Lead to repeat failures
• Create unnecessary downtime

 Replacing all 6 at once gives you a fresh baseline and peace of mind.

Do these injectors need to be programmed or calibrated?

No additional calibration is required. These are direct replacement, plug-and-play injectors.

What warranty do these come with?

1-Year No Questions Asked Replacement Warranty

If an injector fails, we replace it. No runaround. No corporate nonsense. Just how it should be.

How fast do these ship?

Most orders ship same day or next business day, depending on inventory and order time.