After researching manufacturer specifications, industry standards, and aggregated owner feedback, we compared the most popular upgrades for the 6.7 Cummins diesel engine. Our evaluation focuses on performance gains, durability, ease of installation, and safety. Below are our top picks, each with honest limitations.
| Photo | Product | Score | Buy |
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Edge Products Insight CTS3 Monitor and Tuner Best Overall Tuner 5 presets, 4.3-inch touchscreen, EGT/boost/trans temp monitoring |
9.2 | 🛒 Check Price |
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AFE Power 49-51021P Bladerunner Intercooler Pipe Kit Best Intake Upgrade Mandrel-bent 4-inch aluminum pipes, silicone couplers, T-bolt clamps |
8.7 | 🛒 Check Price |
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Mishimoto MMRAD-CUM-08 Aluminum Radiator Best Cooling Upgrade All-aluminum 2-row core, 40% more cooling capacity than OEM |
8.4 | 🛒 Check Price |
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BD Diesel 1030020 Max Power 2.0 Injectors Best Fuel System Upgrade 100% over stock flow, 12-hole nozzle, direct replacement |
8.1 | 🛒 Check Price |
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MBRP S5120ALR 5-Inch Exhaust System Best Exhaust Upgrade 5-inch aluminized steel, turbo-back, single side exit |
8.3 | 🛒 Check Price |
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S&B Filters 75-5060 Cold Air Intake Best Air Intake Dry filter, powder-coated aluminum tube, open-element design |
7.8 | 🛒 Check Price |
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Sinister Diesel EGR Delete Kit (2007-2012) Best Emissions Delete Includes block-off plates, gaskets, and coolant bypass hose |
7.3 | 🛒 Check Price |
1. Edge Products Insight CTS3 Monitor and Tuner: Best Overall Tuner
In our research and comparison of tuners for the 6.7 Cummins, the Edge Products Insight CTS3 stands out for integrating a full-color touchscreen monitor with a powerful tuner. Based on owner feedback and the spec sheets, it offers five pre-loaded tunes that adjust fuel delivery and timing, with real-time tracking of exhaust gas temperature, boost, and transmission temperature. This helps prevent overheating and other common issues when adding power.
However, the CTS3 is not the cheapest option, and some users report that the screen can be difficult to read in direct sunlight. If you prefer a simpler, less expensive tuner without monitoring, consider a dedicated tuner like the Bully Dog BDX. But for those who want an all-in-one solution with safety features, this is our top recommendation.
- Combines monitoring and tuning in one unit with customizable display
- Pre-loaded tunes for towing, economy, and performance
- Real-time data logging and diagnostic code reading
Pros: Comprehensive monitoring reduces risk of engine damage; Easy to install and intuitive interface
Cons: Price is higher than basic tuners
2. AFE Power 49-51021P Bladerunner Intercooler Pipe Kit: Best Intake Upgrade
Our evaluation of intake upgrades for the 6.7 Cummins found that the AFE Power Bladerunner Intercooler Pipe Kit significantly improves airflow over the factory plastic pipes. Based on manufacturer specs and owner reports, the mandrel-bent aluminum pipes reduce restriction, leading to quicker turbo spool and lower exhaust gas temperatures. The kit includes all necessary hardware and is designed for a direct fit.
That said, compatibility can be an issue if you already have an aftermarket cold air intake; some trimming may be required. Also, the price is higher than silicone hose replacements. If you are running a stock intake and want a durable performance boost, this is a solid choice. However, if your truck is heavily modified, check fitment carefully.
- Replaces restrictive factory intercooler pipes for improved airflow
- Constructed from heavy-duty 6061 aluminum with smooth mandrel bends
- Includes high-temperature silicone couplers and stainless steel T-bolt clamps
Pros: Noticeable reduction in turbo lag and lower EGTs; Bolt-on installation with no cutting required
Cons: May not fit trucks with aftermarket cold air intakes without modification
3. Mishimoto MMRAD-CUM-08 Aluminum Radiator: Best Cooling Upgrade
In our comparison of cooling upgrades, the Mishimoto MMRAD-CUM-08 aluminum radiator proved to be a top performer for the 6.7 Cummins. According to manufacturer claims and owner feedback, it offers 40% more cooling capacity than the stock radiator, which is crucial for trucks used for towing or performance tuning. The all-aluminum construction resists cracking and corrosion common with OEM plastic tanks.
However, the installation is more involved than a standard radiator swap, and some owners report that the drain plug can be awkward to access. Additionally, it is not compatible with automatic transmissions that use an internal cooler. If you have a manual transmission or an aftermarket transmission cooler, this radiator is an excellent upgrade. For automatic trucks, check compatibility before purchase.
- Direct-fit replacement for 2007-2018 6.7 Cummins with 6-speed manual or 68RFE
- TIG-welded 100% aluminum core and tanks for maximum durability
- Includes Mishimoto Lifetime Warranty
Pros: Significantly lowers coolant temperatures under heavy load; Built to last with high-quality materials
Cons: Higher price than plastic-tank radiators
4. BD Diesel 1030020 Max Power 2.0 Injectors: Best Fuel System Upgrade
Our research into fuel system upgrades for the 6.7 Cummins identified the BD Diesel Max Power 2.0 Injectors as a high-flow option that can support over 600 horsepower. Based on manufacturer specs and owner reviews, the 12-hole nozzle design improves fuel atomization, which can lead to cleaner combustion and better efficiency. The injectors are a direct replacement for the factory units.
However, installing these injectors is not a simple DIY job; it requires specialized tools and knowledge to set pop pressures and ensure proper timing. Additionally, they may cause excessive smoke if the tuning is not matched. This upgrade is best suited for owners who are building a high-performance truck and have access to professional tuning. For stock or mildly modified trucks, sticking with factory injectors is recommended.
- Increases fuel delivery for higher horsepower applications
- Precision-machined nozzles for improved atomization
- Includes new injector hold-down clamps and copper washers
Pros: Significant power gains when paired with a tuner; Better fuel economy under light throttle
Cons: Installation requires professional expertise and calibration
5. MBRP S5120ALR 5-Inch Exhaust System: Best Exhaust Upgrade
In our evaluation of exhaust systems, the MBRP S5120ALR 5-inch turbo-back exhaust stands out for its flow capacity and build quality. According to owner feedback and manufacturer data, the 5-inch diameter significantly reduces backpressure compared to stock, which can lower exhaust gas temperatures and improve turbo spool. The mandrel-bent tubing ensures smooth flow, and the aluminized steel construction offers good corrosion resistance.
However, the aluminized coating is not as durable as stainless steel, and in areas with road salt, it may eventually rust. Also, the sound is noticeably louder than stock, which may not appeal to everyone. If you want maximum performance and don’t mind a bit of noise, this is a great choice. For those who prefer a more subdued tone or need maximum corrosion resistance, consider a stainless steel option like the MBRP S5100ALR.
- Largest diameter exhaust for maximum flow and reduced backpressure
- Mandrel-bent tubing for smooth exhaust flow
- Includes heavy-duty hangers and clamps
Pros: Deep, aggressive sound without being overly loud; Lower EGTs and improved turbo response
Cons: Aluminized steel may rust in harsh climates over time
6. S&B Filters 75-5060 Cold Air Intake: Best Air Intake
Our research into air intake systems for the 6.7 Cummins found the S&B Filters 75-5060 to be a reliable and cost-effective option. Based on owner reports and specs, it provides a significant increase in airflow, which can improve throttle response and fuel economy. The dry filter design means no oiling is required, reducing the risk of contaminating the MAF sensor. Installation is straightforward, and the clear sight window is a handy feature.
However, the open-element design can draw in hot engine bay air if not properly shielded, potentially reducing gains. Also, some owners report a louder turbo whistle, which may not be desirable. If you are looking for a simple, affordable way to improve airflow without complex modifications, this intake is a solid pick. For maximum cold air, consider a sealed system like the aFe Power Magnum FORCE.
- Increases airflow up to 50% over stock for better throttle response
- Includes a clear sight window to check filter condition
- Easy installation with no tuning required
Pros: Affordable upgrade with noticeable gains; Reusable filter reduces replacement costs
Cons: May slightly increase turbo noise, which some find annoying
7. Sinister Diesel EGR Delete Kit (2007-2012): Best Emissions Delete
In our evaluation of emissions-related upgrades, the Sinister Diesel EGR Delete Kit is a popular choice for 2007-2012 6.7 Cummins owners. According to owner feedback, removing the EGR system can reduce exhaust gas temperatures and prevent the common EGR cooler failure. The kit includes high-quality block-off plates and gaskets for a leak-free seal.
However, this modification is illegal for on-road use in many areas and can result in fines or failed inspections. Additionally, installation requires removing the intake manifold and significant disassembly, which is not for beginners. You will also need a tuner to clear the check engine light. This upgrade is best for off-road or competition use only. If you need to stay emissions-compliant, skip this product.
- Removes EGR valve and cooler to eliminate soot recirculation
- Reduces engine heat and potential for EGR cooler failure
- Includes all necessary hardware for a complete delete
Pros: Lowers EGTs and improves engine reliability; Cleans up engine bay and simplifies maintenance
Cons: Installation is labor-intensive and may require tuning
Frequently Asked Questions
What is the most important upgrade for a 6.7 Cummins?
Based on our research, a tuner and monitor like the Edge Products Insight CTS3 is often the most impactful upgrade. It allows you to optimize power and fuel economy while monitoring critical parameters to prevent damage.
Do I need a tuner after installing a cold air intake or exhaust?
Generally, no. Most intakes and exhaust systems are designed to work with the stock ECU. However, for maximum gains and to avoid a check engine light, a tuner can help adjust for increased airflow.
Will an EGR delete void my warranty?
Yes, removing the EGR system will void your powertrain warranty and is illegal for on-road use in most regions. We recommend checking local laws before installing such a kit.
Can I install an intercooler pipe kit myself?
Most intercooler pipe kits are bolt-on and can be installed by a competent DIYer with basic tools. However, some trimming may be needed, and you should have a torque wrench for clamps.
How much horsepower can I expect from these upgrades?
Gains vary widely. A tuner alone can add 50-100 horsepower, while combined with intake and exhaust, 100-150 horsepower is possible. Injectors and other mods can push over 600 horsepower with proper tuning.
Our Verdict
After researching and comparing the best upgrades for the 6.7 Cummins, our top pick is the Edge Products Insight CTS3 for its combination of tuning and monitoring capabilities. For those focused on cooling, the Mishimoto aluminum radiator is an excellent runner-up.
Last reviewed and spec-checked: June 8, 2026. We re-check our picks and listings periodically.
