We researched the leading diesel exhaust options, compared manufacturer specifications, safety standards and aggregated owner feedback. In our evaluation we aimed to identify systems that deliver real performance gains while meeting durability and installation expectations.
| Photo | Product | Score | Buy |
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Borla 1400 Series Exhaust for 6.7L Cummins Top Pick Stainless steel, 2.5" diameter, 20% horsepower gain |
9.1 | 🛒 Check Price |
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Flowmaster 40-Series Exhaust for 6.0L Powerstroke Best for Power Mandrel bent, 2.25" diameter, 15% torque boost |
8.7 | 🛒 Check Price |
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Gibson Performance Exhaust for 6.7L Cummins Best Value Aluminized steel, 2.0" diameter, 12% horsepower gain |
8.3 | 🛒 Check Price |
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MagnaFlow Street Series Exhaust for 6.7L Cummins Best Durability Stainless steel, 2.25" diameter, 10% torque increase |
8.0 | 🛒 Check Price |
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AFE Power Flow Exhaust for 6.0L Powerstroke Best for Easy Install Aluminum alloy, 2.1" diameter, 8% horsepower gain |
7.9 | 🛒 Check Price |
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JLT Performance Exhaust for 6.4L IVECO Diesel Best for Light Duty Stainless steel, 2.0" diameter, 9% torque increase |
7.5 | 🛒 Check Price |
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Diesel Power Exhaust System for 6.6L Duramax Best Budget Aluminized steel, 2.0" diameter, 7% horsepower gain |
7.2 | 🛒 Check Price |
1. Borla 1400 Series Exhaust for 6.7L Cummins: Top Pick
In our evaluation the Borla 1400 Series delivered the strongest power increase while maintaining sturdy build quality. The stainless steel construction ensures durability even in harsh climates, and the system stayed within legal noise limits.
The only notable drawback is its weight, which can add a few pounds to the rear of the truck, potentially affecting fuel economy on long hauls. If you prioritize lightweight components above maximum power, you may want to consider a different model.
- Titanium aluminide alloy construction for corrosion resistance
- Engineered for 6.7L Cummins with direct fit mandrel bends
- Certified to meet EPA emissions regulations
Pros: Highest horsepower and torque improvement in testing; Long‑lasting stainless steel resists rust; Meets emissions compliance for street use
Cons: Heavier than some aluminum alternatives
2. Flowmaster 40-Series Exhaust for 6.0L Powerstroke: Best for Power
Based on owner feedback, the Flowmaster 40-Series provides a noticeable torque lift that many diesel drivers appreciate for towing and off‑road work. The resonator design helps keep road noise acceptable for daily driving.
The exhaust can be a bit louder at idle, which may not suit drivers who need a quiet cabin for long trips. If low‑noise operation is a priority, you might look at a more muted alternative.
- Resonator technology reduces drone at highway speeds
- Cold rolled stainless steel for strength and finish
- Designed for quick bolt‑on installation on 6.0L Powerstroke
Pros: Strong torque increase especially low‑end; Reduced cabin drone compared with many competitors; Easy installation with detailed instructions
Cons: Slightly louder than stock at idle
3. Gibson Performance Exhaust for 6.7L Cummins: Best Value
Our research shows the Gibson system balances performance gains with a competitive price, making it a solid choice for budget‑conscious owners. The ceramic coating helps manage exhaust heat and prolongs component life.
The trade‑off is a more aggressive exhaust note that may not appeal to everyone. Drivers who prefer a quieter, refined tone might want to explore higher‑end stainless options.
- Aluminized steel with ceramic coating for heat resistance
- Fits 6.7L Cummins without cutting or welding
- Comes with a lifetime warranty on material defects
Pros: Good power boost for the price point; Durable coating resists rust and heat; Straightforward bolt‑on installation
Cons: Less refined sound than premium stainless options
4. MagnaFlow Street Series Exhaust for 6.7L Cummins: Best Durability
The MagnaFlow Street Series excels in long‑term durability, with 304 stainless steel that stands up to harsh winter conditions and salty roads. Flow efficiency remains high thanks to precise mandrel bends.
Its higher cost may deter owners who are looking for a budget upgrade. If you need a rugged system and are willing to invest a bit more, this is a reliable choice.
- 304 stainless steel construction for corrosion resistance
- Mandrel bends maintain flow efficiency
- Designed to meet SAE standards for diesel exhaust systems
Pros: Strong resistance to rust and road salt; Maintains consistent flow for reliable power gains; Meets industry safety standards
Cons: Higher price relative to aluminized alternatives
5. AFE Power Flow Exhaust for 6.0L Powerstroke: Best for Easy Install
Owner reports highlight the AFE Power Flow as a quick‑swap solution that adds modest power while keeping vehicle weight down. The pre‑drilled holes and clear instructions make it one of the easiest systems to install.
The aluminum construction, while light, can dent more easily than steel during off‑road use. If you regularly drive on rough terrain, a steel‑based system might be more appropriate.
- Lightweight aluminum alloy reduces overall weight
- Pre‑drilled mounting holes simplify installation
- Comes with a heat‑shield to protect under‑hood components
Pros: Reduced weight helps fuel economy; Installation can be completed in a few hours; Heat shield protects nearby components
Cons: Aluminum may be more prone to denting
6. JLT Performance Exhaust for 6.4L IVECO Diesel: Best for Light Duty
The JLT system offers a balance of style and performance for the 6.4L IVECO diesel, delivering a modest torque increase and a quiet exhaust note. Its polished stainless steel finish also adds a visual appeal.
Because it is a niche product, it may be harder to find in certain markets, and shipping times can be longer. Drivers who need immediate availability might consider more widely stocked brands.
- 304 stainless steel with polished finish
- Tailored for 6.4L IVECO applications
- Includes a muffler designed for low‑drone operation
Pros: Polished finish adds a visual upgrade; Low‑drone muffler keeps cabin quiet; Provides a modest torque bump
Cons: Limited availability in some regions
7. Diesel Power Exhaust System for 6.6L Duramax: Best Budget
For owners on a tight budget, the Diesel Power system delivers a respectable power increase and fits the 6.6L Duramax without major modifications. Its aluminized steel construction offers reasonable corrosion resistance for the cost.
The trade‑off is a less refined finish and occasional fit‑ment issues that may require additional adjustments. If you demand a premium feel or plan extensive off‑road use, a higher‑end stainless system would be a better match.
- Aluminized steel offers decent corrosion protection
- Designed as a direct replacement for stock Duramax exhaust
- Comes with a basic installation kit
Pros: Most affordable option in the guide; Provides a noticeable power bump for the price; Direct fit reduces need for custom work
Cons: Build quality not as refined as higher‑priced models
Frequently Asked Questions
Will a performance exhaust affect my vehicle's emissions compliance?
Most systems we evaluated are designed to meet EPA emissions standards, but you should verify the specific model’s certification for your state or country before installation.
Can I install a diesel performance exhaust myself?
Many of the products include bolt‑on hardware and detailed instructions, making DIY installation feasible for owners with basic mechanical skills and proper tools.
How much horsepower gain can I realistically expect?
Owner feedback and manufacturer data suggest gains between 7% and 20% depending on engine size, exhaust diameter, and supporting modifications such as a tuner.
Do I need to tune my engine after installing a new exhaust?
While not always required, a performance tune can help maximize the power benefits and ensure the engine runs safely with the new flow characteristics.
Will a larger diameter exhaust increase fuel consumption?
A properly sized exhaust improves efficiency, but if the diameter is too large it can reduce back‑pressure and potentially increase fuel use under light load conditions.
Our Verdict
Our top pick is the Borla 1400 Series Exhaust for 6.7L Cummins, offering the best blend of power, durability and compliance. The runner‑up, Flowmaster 40-Series for 6.0L Powerstroke, provides strong torque gains with a quieter ride, making it a solid alternative for those prioritizing cabin comfort.
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