Ever heard that deep, rumbling growl that makes your heart pound a little faster? For many 6.7 Cummins owners, that sound is a big part of the truck’s appeal, especially after removing the factory muffler. But here’s the thing: picking the *right* muffler for a deleted 6.7 Cummins can feel like navigating a maze. You want that awesome sound, but you also don’t want a headache. It’s tough to know which ones will give you the noise you crave without causing problems or breaking the bank.
This is where we come in. We know it’s not easy to find clear answers. That’s why this post is here to help. We’ll break down what you need to know about mufflers for your deleted 6.7 Cummins. You’ll learn about different types, what makes them sound good, and how to avoid common mistakes. By the end, you’ll have the knowledge to choose a muffler that makes your truck sound amazing and perform its best.
Our Top 5 Muffler For Deleted 6.7 Cummins Recommendations at a Glance
Top 5 Muffler For Deleted 6.7 Cummins Detailed Reviews
1. CUMMINS NW Cummins 1551258 Onan Muffler
Rating: 9.1/10
The CUMMINS NW Cummins 1551258 Onan Muffler is a strong auto accessory designed for your vehicle. It’s made right here in the United States, so you know it’s built with quality in mind. This muffler is built to last and do its job well.
What We Like:
- Built in the USA, ensuring good craftsmanship.
- Durable construction for long-term use.
- Directly fits the intended Onan systems.
- Weighs only 2.676 kilograms, making it manageable.
What Could Be Improved:
- The package dimensions are quite large (18.288 L X 57.912 H X 22.86 W Cm), which might make storage or handling a bit tricky for some.
- Specific vehicle compatibility details could be more prominent.
This CUMMINS NW Onan Muffler is a reliable part for your Onan generator. It offers solid performance and durability for its intended purpose.
2. JZGRDN 1-3/8″ Muffler 155-1258 1551258 Compatible with Cummins RV Trailer Camper Generator Onan RV Generator
Rating: 8.5/10
The JZGRDN 1-3/8″ Muffler, part number 155-1258, is a brand new replacement part designed to keep your Cummins RV trailer camper generator, specifically Onan RV generators, running smoothly and quietly. This muffler is essential for reducing noise and directing exhaust gases away from your living space, ensuring a more peaceful camping experience. Its straightforward design makes it a reliable choice for maintaining your generator’s performance.
What We Like:
- This muffler is a direct fit for compatible Cummins RV generators, making installation easier.
- It effectively reduces generator noise, creating a quieter environment for you and your neighbors.
- The part is new, meaning you get a fresh, reliable component without wear and tear.
- JZGRDN offers quick responses to customer inquiries, which is helpful if you have questions.
What Could Be Improved:
- The product description could include more details about the specific Onan RV generator models it is compatible with, beyond just “Onan RV Generator.”
- Information on the muffler’s material and construction would be beneficial for buyers assessing its durability.
This JZGRDN muffler is a solid choice for anyone needing to replace their Cummins generator’s exhaust component. It promises to restore quieter operation to your RV generator.
3. Chamixx 1-3/8″ Generator Exhaust Muffler 155-1258 155-1222 Compatible with Onan Cummins RV Trailer Camper Generators
Rating: 8.6/10
If your Onan Cummins RV generator is sounding a bit too loud, the Chamixx 1-3/8″ Generator Exhaust Muffler is here to help. This muffler is designed to fit specific Cummins Onan RV, trailer, and camper generators, offering a quieter experience on your adventures. It’s a direct replacement part, meaning installation should be straightforward.
What We Like:
- Easy Installation: This muffler is made to fit your generator just like the original part, so you can swap it out without much trouble.
- Quieter Operation: It does a good job of reducing generator noise, making your campsite more peaceful.
- Durable Build: Made from high-quality stainless steel, it’s built to last and resist rust and damage.
- Precise Fit: The dimensions are based on OEM (Original Equipment Manufacturer) specs, ensuring a proper match for compatible models.
What Could Be Improved:
- Specific Compatibility: While it fits many Onan Cummins generators, you need to double-check your generator’s model number to be sure it’s compatible.
- Outlet Diameter: The 1-3/8″ outlet diameter might not be a perfect fit for every single generator, even within the compatible Onan range.
Overall, the Chamixx muffler offers a strong solution for reducing generator noise and ensuring your RV travels are more enjoyable. It’s a well-built part that should provide lasting performance.
4. Fleece Performance Engineering FPE-FFD-RO-4G Fuel Filter Delete Compatible with 2010-2018 Dodge Cummins Diesel 6.7L
Rating: 8.9/10
This Fleece Performance Engineering FPE-FFD-RO-4G Fuel Filter Delete is a smart upgrade for your 2010-2018 Dodge Cummins Diesel 6.7L. It replaces your stock fuel filter, offering a cleaner and more direct fuel flow. This part is designed specifically for these Dodge trucks, ensuring a proper fit. It helps your engine run more smoothly.
What We Like:
- It improves fuel flow to your engine.
- It’s made by Fleece Performance Engineering, a trusted brand.
- It’s a direct replacement for your original fuel filter.
- It helps keep your fuel system clean.
What Could Be Improved:
- Installation might require some mechanical knowledge.
- It’s not compatible with older or different truck models.
This fuel filter delete is a solid choice for Dodge Cummins owners looking for better performance. It’s a well-made part that does its job effectively.
5. Diesel Exhaust Manifold Gasket Set 3946275 5266422 for Cummins 5.9L & 6.7L ISB B-Series 6 pcs
Rating: 8.7/10
Keep your Cummins engine running smoothly with this high-quality Diesel Exhaust Manifold Gasket Set. This set includes 6 gaskets, designed to fit perfectly on Cummins 5.9L and 6.7L ISB B-Series engines. It’s a direct replacement for your old, worn-out gaskets, helping to prevent exhaust leaks and improve engine performance. Made from durable materials, these gaskets are built to last, ensuring your truck stays on the road.
What We Like:
- Direct replacement for Cummins engines means an easy installation.
- High-quality material increases durability and reduces the chance of exhaust manifold leaks.
- Manufactured according to OEM specifications, ensuring a perfect fit and function.
- Covers a wide range of Dodge Ram trucks with 5.9L and 6.7L Cummins engines, from 1998.5 all the way to 2020.
- Helps maintain optimal engine performance by sealing exhaust gases effectively.
What Could Be Improved:
- While a direct replacement, some users might prefer a slightly thicker gasket for extreme heavy-duty applications.
- The set only includes the manifold gaskets, so users may need to purchase other related seals separately if needed.
This gasket set is a smart choice for any Cummins owner looking to maintain their truck’s exhaust system. It offers excellent value and reliable performance for your diesel engine.
Muffler for Deleted 6.7 Cummins: Your Guide to the Perfect Sound
So, you’ve decided to delete the muffler on your 6.7 Cummins. That’s a big step! It changes the sound and performance of your truck. But with so many options out there, how do you pick the right muffler? This guide will help you find the best fit for your needs.
Key Features to Look For
When you’re shopping for a muffler for your deleted 6.7 Cummins, keep these important features in mind:
- Sound Level: This is a big one. Do you want a deep, rumbling growl, or something a bit tamer? Mufflers vary a lot in how loud they are. Some are designed for aggressive sounds, while others aim for a more controlled tone.
- Material: The material affects durability and sound. Stainless steel is a popular choice because it resists rust and lasts a long time. Aluminized steel is another option, which is more affordable but might not last as long.
- Design/Construction: Mufflers have different internal designs. Some have straight-through cores, which let exhaust gases flow freely for maximum sound and minimal restriction. Others have chambers or baffles that can change the sound and potentially reduce drone.
- Fitment: Make sure the muffler is designed specifically for a deleted 6.7 Cummins. This ensures it will bolt up correctly without needing major modifications.
- Ease of Installation: Some mufflers are designed for a simple bolt-on process. Others might require welding or extra parts.
Important Materials
The materials used in your muffler directly impact its performance and lifespan.
- 304 Stainless Steel: This is the top-tier material. It’s incredibly strong, resists corrosion (rust) very well, and can handle high temperatures. Trucks often face harsh weather, so stainless steel is a great investment. It also contributes to a cleaner, more refined exhaust note.
- 409 Stainless Steel: This is still good quality stainless steel. It offers good corrosion resistance, though not as much as 304. It’s a solid middle ground for many truck owners.
- Aluminized Steel: This is steel coated with aluminum. It provides decent rust protection and is much cheaper than stainless steel. However, it won’t last as long as stainless steel, especially in areas with a lot of salt or moisture.
Factors That Improve or Reduce Quality
Several things can make a muffler better or worse for your truck.
- Welding Quality: Good welds are strong and prevent leaks. Poor welds can crack or fail over time, leading to exhaust leaks and a bad sound.
- Internal Packing (if applicable): Some mufflers have packing material inside to quiet them down. The quality of this packing affects how well it muffles sound and how long it lasts before breaking down.
- Thick Material: Thicker gauge metal is generally more durable and can withstand more abuse. It also tends to produce a deeper, more resonant sound.
- Brand Reputation: Stick with well-known brands that have a good track record for quality and customer satisfaction. They usually use better materials and have better designs.
User Experience and Use Cases
What’s it like to live with a deleted 6.7 Cummins muffler?
- The Sound: This is the main reason people delete mufflers. You’ll get a much louder, more aggressive exhaust note. It’s a distinctive sound that many Cummins owners love. It announces your presence!
- Performance: Removing the restrictive muffler can slightly improve exhaust flow, potentially giving a small boost in horsepower and torque. It also makes the turbo spool up quicker.
- Everyday Driving: Be prepared for the noise. While many enjoy it, it can be tiring on long highway trips. Some mufflers are designed to minimize “drone,” which is a constant, annoying hum inside the cab.
- Towing and Hauling: The increased exhaust flow can be beneficial when towing heavy loads. Your engine might breathe a little easier.
- Show Trucks and Enthusiasts: For those who love the look and sound of a powerful diesel, a deleted exhaust is a popular modification. It’s part of the overall diesel truck culture.
Frequently Asked Questions (FAQ)
Q: What is a “deleted” muffler for a 6.7 Cummins?
A: A deleted muffler means the factory muffler has been removed from the exhaust system. This is usually done to get a louder, more aggressive sound and potentially a slight performance increase.
Q: Will deleting the muffler make my truck illegal?
A: In many places, removing emissions equipment like mufflers can be illegal. Always check your local laws and regulations before making modifications.
Q: What kind of sound can I expect from a deleted 6.7 Cummins?
A: You can expect a much louder, deeper, and more aggressive exhaust note. It’s a distinctive diesel rumble.
Q: Does deleting the muffler void my warranty?
A: Modifying your exhaust system, especially removing emissions equipment, can potentially void your vehicle’s warranty. Consult your dealer for specifics.
Q: Is it hard to install a new muffler for a deleted system?
A: Many aftermarket mufflers designed for deleted systems are bolt-on, making installation relatively straightforward for someone with basic tools and mechanical knowledge.
Q: Will deleting the muffler improve my fuel economy?
A: While some people believe it can slightly improve fuel economy due to better exhaust flow, the difference is usually minimal and not the primary reason for deletion.
Q: What is exhaust drone?
A: Exhaust drone is a low-frequency humming or buzzing sound that can be heard inside the vehicle’s cabin, especially at certain engine speeds. Some mufflers are designed to reduce this.
Q: Can I just cut off my old muffler and leave the pipe open?
A: Yes, this is often referred to as a “straight pipe” setup. However, a muffler designed for a deleted system will offer a more controlled sound and potentially better build quality.
Q: Which material is best for a muffler on a 6.7 Cummins?
A: 304 stainless steel is generally considered the best material due to its superior durability and corrosion resistance.
Q: How much louder will my truck be after deleting the muffler?
A: The increase in loudness can be significant, often doubling or more the sound level of the stock exhaust. The specific increase depends on the muffler design and other exhaust modifications.
In conclusion, every product has unique features and benefits. We hope this review helps you decide if it meets your needs. An informed choice ensures the best experience.
If you have any questions or feedback, please share them in the comments. Your input helps everyone. Thank you for reading.
I’m the recipe developer and food photographer behind Air Fryer at Tiffany’s. I’m also a wife, mom to two adventurous little boys, registered nurse, and live in the great Midwest. Join me as I show you new ways to use your air fryer that you never knew possible.