Choosing the best Cummins turbocharger upgrade comes down to three questions: what is your real power goal, do you want a single or a compound setup, and which year Cummins do you have. A turbo that is too small runs out of breath and makes heat up top, while one that is too large is lazy and lags off the line. Matched correctly, a turbo upgrade wakes a Cummins up, drops exhaust temperatures under load, and gives injectors and fuel the air they need to make clean power. This guide walks through how to size a Cummins turbo, single versus compound, the year fitment you must get right, and our top ATS and BD Diesel picks so you buy once and buy correctly.
Single vs compound: which do you need
The first choice is the type of setup, and it follows your power goal more than anything else.
- Single turbo upgrade: a larger single, or a drop-in that fits the factory location, is the simplest path. It is ideal for a daily and tow truck or a moderate build that wants better airflow, lower exhaust temps, and a clean install without major plumbing.
- Compound turbos: a compound kit runs a small high-pressure turbo feeding a large low-pressure turbo, giving both quick spool and huge top-end airflow. This is the path for serious power, heavy towing at high output, and builds that have outgrown a single.
The best Cummins turbocharger upgrade for you is the one that matches your goal. Do not buy a compound kit for a stock-ish daily, and do not expect a mild single to feed a big-injector build.
Get the year fitment right
Cummins turbo kits are built for specific engine ranges, so match your exact truck before anything else:
- 1994-1998 5.9L (12-valve): its own turbo and mounting.
- 1998.5-2002 5.9L (24-valve): a different setup from the 12-valve.
- 2003-2007 5.9L common-rail: its own kits, both single and compound.
- 2007.5-2018 6.7L: the variable-geometry era, with its own single and compound options.
Confirm the year and engine, then choose the setup. Fitment matters more than chasing a specific brand.
Our top Cummins turbo picks
These ATS and BD Diesel setups cover the common Cummins needs from a strong single to a serious compound build, sorted by platform.
Best compound kit for the early 5.9L (1994-1998)
For the 12-valve trucks, the ATS Aurora 3000/5000 compound turbo kit for the 94-98 5.9L pairs quick spool with big top-end air for a serious build.
Best compound kits for the 5.9L common-rail (2003-2007)
For the common-rail trucks, the ATS Aurora Plus 5000 kit is a strong street-and-tow compound choice, and the Aurora 4000/7500 compound kit steps up for a higher-power build.
How to choose your size
Pick the smallest turbo that meets your goal, because a right-sized turbo spools quicker, tows cooler, and lives longer than an oversized one chased for a peak number. Start from your target power and typical use, daily and tow or dedicated build, and let that decide single versus compound and how large to go.
Best for the 6.7L (2007.5 and up)
For the 6.7L, the ATS Aurora Plus 5000 kit for the 07.5-09 6.7L is a proven compound setup, and for the later trucks the BD Diesel Screamer turbo and manifold package for the 13-18 6.7L is a strong single-turbo upgrade with the manifold included.
You can compare turbos, kits, and actuators in our diesel turbo parts section.
Match the turbo to the rest of the build
A turbo is one part of a system. To use a bigger turbo you need fuel to match, meaning injectors and a pump sized for the airflow, a tune written for the turbo, and healthy exhaust and intake plumbing so the turbo can breathe. A big turbo on stock fuel will be lazy, and big fuel on a small turbo makes heat and smoke. If you are also planning injectors, our guide on the best Cummins fuel injector upgrades covers sizing, and our 5.9 vs 6.7 Cummins comparison explains the platform differences that shape your turbo choice.
Signs your Cummins turbo needs attention
A worn or undersized turbo shows itself in a few ways. Watch for high exhaust gas temperatures under load, especially when towing, a whistle or grinding from the turbo, oil in the intake tract from worn seals, sluggish spool and slow throttle response, and boost that will not hold. On the 6.7L, a variable-geometry turbo that sticks from soot can set boost codes and cause limp mode. If your truck is down on air, running hot up top, or you have added fuel that the stock turbo cannot feed, a properly sized upgrade is usually the fix, and it is the moment to decide between a stronger single and a compound setup.
Frequently Asked Questions
Single or compound turbo for a Cummins?
A single or drop-in is the best Cummins turbocharger upgrade for a daily, tow, or moderate build that wants better airflow and lower exhaust temps with a clean install. Compound turbos are for serious power and heavy high-output towing, where you need both quick spool and big top-end air.
Will a bigger turbo add power by itself?
No. A turbo needs matching fuel and a tune to make its power. A big turbo on stock fuel is lazy, and big fuel on a small turbo makes heat. Balance the turbo, injectors, pump, and tune together.
Do 5.9L and 6.7L Cummins use the same turbo kits?
No. The 12-valve, 24-valve, 5.9L common-rail, and 6.7L each use their own turbo setups, and they are not interchangeable. Confirm your exact year and engine before choosing a kit.
What supporting parts do I need for a turbo upgrade?
Fuel to match the airflow, meaning injectors and a pump sized for the goal, a tune written for the turbo, and healthy intake and exhaust plumbing. Balance the whole system for clean, reliable power.
Bottom line
The best Cummins turbocharger upgrade is the one matched to your power goal, your single-or-compound choice, and your exact year. A strong single suits a daily, tow, or moderate build, while a compound kit feeds a serious high-output truck. Confirm your 5.9L or 6.7L fitment first, size the turbo to your fuel and tune, and keep the intake and exhaust healthy, and your Cummins makes clean power with cooler exhaust temps under load.
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