The Ram 2500/3500 pickup is a great truck. When the truck is equipped with the legendary 6.7l Cummins diesel engine, it becomes a serious workhorse of a truck. Opening the exhaust up for better flow will increase performance and improve fuel economy while taming the sound of your exhaust. There are tons of products on the market that are junk, but only a handful that are worth buying. We looked at the most popular options to find the best exhaust for 6.7 Cummins. The MBRP S61340 is the best option for improving your exhaust.
Best Exhaust for 6.7 Cummins – Top Picks:
| MBRP S61340PLM | Diamond Eye K5252A | Stainless Race 4 | MagnaFlow 18954 | |
|---|---|---|---|---|
 |  |  |  | |
| OEM Part Number | S61340PLM | K5252A | BL1023 | 18954 |
| Model Years | 2010-2012 | 2007-2012 | 2013-2017 | 2007-2018 |
| Engine Type | 6.7L L6 | 6.7L L6 | 6.7L L6 | 6.7L L6 |
| Item Weight (pounds) | 39 | No data | No data | 63 |
| Latest Price | Find on Amazon | Find on Amazon | Find on Amazon | Find on Amazon |
There are reasons we chose the MBRP exhaust over other products. We are going to give you the facts about what makes this an excellent choice and show you some examples of reasons you should avoid other products.
MBRP S61340PLM
This is a complete, bolt-on cat-back exhaust kit that gives you an oversized pipe for better exhaust flow characteristics. The main benefits to this kit over others are that it actually fits correctly. Most kits you’ll buy claim to fit, but will need extensive modification to the brackets to clear suspension parts and the bumper of the truck.
This is an aluminized steel exhaust that carries a two-year manufacturer’s warranty. It is ideal as a factory replacement to repair rusted or damaged parts. This exhaust deletes the resonator but does not make your truck much louder than stock. In fact, most owners say that the sound is more mellow than factory and are pleased with the result.
Pros
- Easy to install and fits like a factory part
- Oversize exhaust mellows the sound of the loud diesel engine
- Two-year warranty is good insurance that the product will last for more than one winter
Cons
- Aluminized pipe isn’t as corrosion resistant as stainless steel
- Can’t use an exhaust tip without modifications
Diamond Eye K5252A
This is essentially a budget version of the above product. Keep in mind that you get what you pay for. This kit may or may not fit correctly. Some installers had no trouble while others needed to cut and reweld hangers to correctly position the pipe. This kit includes an oversize five-inch exhaust that deletes the resonator and exits behind the rear tire.
The aluminized pipe appears to be low quality and will likely begin to rust in the first season of use. There is no warranty, so once you have a problem, you’ll need to replace the kit again. This may be a good solution for someone who is simply looking to quickly and cheaply repair damaged parts, but this wouldn’t be a top choice for your work truck.
Pros
- Inexpensive option for replacing damaged factory parts
Cons
- Cheaply made steel pipe will likely rust quickly
- Hangers don’t always line up
- Some installer found that the pipe was incorrectly bent and required extensive modification to work
Stainless Race 4
This exhaust kit is an okay product, but it’s likely to get you in trouble. This is a straight-pipe kit that eliminates the resonator and provides the easiest path for fumes to escape. This is not a good buy if you drive your truck on the street every day. Your Cummins diesel is already a loud truck, using this exhaust kit will violate exhaust sound laws in many jurisdictions.
There are a few problems with this kit. The manufacturer claims the pipes to be stainless, but does not provide the type of stainless. Many types are not appropriate for use in diesel exhaust that produces high levels of corrosive gasses and soot that cause rapid corrosion. The manufacturer offers a 30-day replacement for defects in workmanship.
Pros
- Simple design that is appropriate for race trucks
- May be more corrosion resistant than steel pipe
Cons
- Too loud for street use
- Won’t improve power or performance over other products due to stock size
- Short return period indicates low quality
MagnaFlow 18954
This is one of those products we hate to see. This kit is sold to appear as though it is a MagnaFlow product. MagnaFlow produces some of the best exhaust kits on the market. This product is not a MagnaFlow product, it is a copy that shamelessly uses factory photographs of the MagnaFlow #17874.
Among the deceptive marketing claims, you’ll notice that there is no information about the actual product on the listing, a clear indication that this product is a cheap copy.
Pros
- There may be no pros to this product
Cons
- Easily exposed as a copy by searching the product number on the MagnaFlow website
Buyers Guide
Your Ram 2500/3500 6.7l Cummins is a powerful truck that gets better with an upgrade to the cat-back exhaust. Choosing the right exhaust kit for your truck means you’ll want to consider the options available. You want to buy a product that fits correctly, holds up well, and doesn’t fall apart.
The Problem with Cheap Parts
You can often get away with inexpensive parts for your passenger car. A cheap exhaust will work just fine and give you years of use. When you buy an exhaust for your diesel truck, you can’t use these inferior parts. Your truck will simply destroy them.
The Diesel Difference
There are key reasons you want to buy the highest quality exhaust for your truck. The exhaust fumes from diesel fuel are more corrosive than fumes from gasoline exhaust. This causes the coatings on mild steel exhaust components to quickly wear, leaving the bare steel exposed to moisture. The fumes from your truck will cause the exhaust to quickly deteriorate and begin leaking.
The other reason to avoid cheap parts is due to the power of your truck. The exhaust takes quite a bit of abuse when the engine is running. The pipes will shake and the deep exhaust note causes vibration in the metal itself. Cheap exhaust components will crack, break, and fall apart quickly.
The final reason to avoid less than ideal parts on your truck is due to the fitment of the exhaust. You want the pipes to hang from the factory locations to keep the exhaust system secure without allowing it to hit the axle, suspension, or body of the truck. Many low-quality and inexpensive exhaust parts are imprecise and don’t line up correctly. Sometimes you can modify the parts so they will fit, but often, you’ll experience premature failure when the parts are stressed due to not fitting correctly.
What Sets MBRP Apart on Our List
We look for a few things when we consider parts for a project online. One of those things is we look for an established company that makes a reliable product and has a good reputation for customer service. MBRP checks all the boxes. We’ve used their parts on numerous projects with a high degree of success.
Conclusion
Buying the best exhaust for your Cummins diesel truck is easy when you know what to look for. We found the best exhaust for 6.7L Cummins diesel trucks so that you don’t have to go through the hassle of finding the right parts and worrying about whether they will fit. The MBRP exhaust kit we feature here today is an ideal factory upgrade or replacement part for a worn-out exhaust (>>> Check on Amazon). It fits correctly, improves performance and fuel efficiency, and looks great, too.