If you're looking straight into a stealth delete 6. 7 Cummins setup, a person probably know that already keeping things looking share is half the battle when attempting to get your own truck running the way it will. Nearly all guys who own the Ram with all the six. 7-liter engine ultimately get tired of the particular "service exhaust system" messages or the dreaded limp mode that comes with the clogged DPF. Yet nobody wants in order to draw unnecessary attention to the fact that their exhausts equipment isn't specifically doing its job anymore.
The 6. seven Cummins is definitely an overall beast of an engine. It's got the torque to a house off the foundation, but let's be honest—it's also choked down by a lot of stock plumbing. When people talk about the "stealth" delete, they aren't just talking about removing the equipment. They're talking about making the vehicle look such as it's still factory-compliant while reaping the particular benefits of better airflow and improved reliability.
What does a stealth delete actually look such as?
In the standard delete, a person just rip out your Diesel Particulate Filter (DPF), the Picky Catalytic Reduction (SCR) canister, and the Exhaust Gas Recirculation (EGR) system. You replace them along with straight pipes and shiny block-off dishes. It's obvious the second you pop the hood or crawl under the particular truck.
The stealth delete 6. 7 Cummins requires a different technique. Rather than replacing the big canisters below the truck along with straight tubing, individuals actually hollow all of them out. You take those DPF and the particular catalytic converter away, "gut" the ceramic honeycombs inside, plus bolt the clear shells back on. Externally, every messfühler, heat shield, plus bracket looks such as it's right where Chrysler put it. Under the hood, the EGR cooler remains in place, also if it's no longer cycling soot back into your intake manifold.
It's a lot more work than simply swapping pipes, however for guys in areas where a visual examination is an actuality, it's often the only approach to take. You get the better fuel economy and the engine long life without a giant "I modified our truck" sign hanging off the frame rail.
The headache of the particular factory EGR system
If you've spent whenever upon the forums, you understand the EGR is generally the first factor people complain regarding. Its job will be to take some of the exhaust gas plus shove it back in to the engine in order to cool off combustion temperature ranges. The thing is that wear out is full of soot. Sending that things back to a top of the line diesel engine is basically like asking it to inhale and exhale its own smoke.
Over time, that soot builds up in the intake plenum as well as the grid heater. It may actually lead to stuck valves if items get bad more than enough. In a stealth delete 6. 7 Cummins build, you don't remove the EGR chiller. If you do, you'd have the big empty area on the side of the engine that shouts "deleted. " Instead, you use internal block-off plates. They are thin shims that will sit between the particular manifold and the cooler. Everything looks connected, but the actual flow of exhaust system gas is halted dead.
Dealing with the DPF and SCR
The "big cans" under the particular truck are the particular most restrictive parts of the entire system. The DPF captures soot, plus when it gets full, the truck goes into "regen" mode, which generally means it sprays extra fuel in to the exhaust to burn off that soot away. It's incredibly ineffective and puts lots of heat stress on the turbo and the particular back cylinders.
To perform a stealth version of this, you've gotta get your hands filthy. Most guys work with a long masonry bit or a crowbar in order to up the filter material inside the DPF. It's a messy, messy job—definitely something you want to do with a great respirator on. Once it's cleared out, the exhaust moves through it such as a straight pipe, but to anyone looking from the particular side of the particular road, it's nevertheless a factory exhaust system system.
The SCR (where the DEF liquid gets sprayed) can usually be treated the same method. The goal is definitely to keep just about all the factory sensors plugged in. Actually if those receptors aren't "reading" anything at all useful since the courage are gone, having them there prevents the red flag in case someone happens in order to look beneath the framework.
You can't forget the fine tuning
Here's the one thing: you can't simply hollow out your exhaust and move for a travel. Your truck's personal computer (the ECM) is constantly monitoring pressure plus temperature sensors. If this sees that the DPF isn't constructing up any pressure, it'll assume some thing is broken and put the truck right into a 5-mph limp setting.
This is definitely where the application arrives in. A stealth delete 6. 7 Cummins needs a tuner to inform the truck's mind to stop looking intended for those emissions parts. You need a "delete tune" that will shuts off the particular EGR, stops the particular DEF injection, plus cancels the regen cycles.
Nowadays, getting hold of these tuners is a bit harder than it utilized to be due to the fact of EPA crackdowns, but they're nevertheless out there. The beauty of modern tuning is it can also give you a good little bump within horsepower and torque while it's with it. Even the "tow tune" may make the vehicle feel 50 percent lighter in weight on its ft.
Why proceed through all the trouble?
You might be asking yourself if it's really worth the effort associated with hollowing out large metal cans instead of just buying a $300 delete pipe. For many people, the answer is all about peace of thoughts.
Initial, there's the dependability factor. As soon as you prevent the soot through entering the motor and stop the particular high-heat regen series, the 6. 7 Cummins becomes a 500, 000-mile motor. You're no longer worrying about essential oil dilution from excess fuel or a clogged DPF leaving you stranded upon a road trip having a heavy movie trailer.
Then there's the fuel mileage. Most guys observe a jump of 2 to 4 miles per one gallon once the pickup truck can actually breathe. That adds up fast if you're using the pickup truck for work or long-distance hauling.
But the "stealth" part will be really about remaining under the adnger zone. Whether it's with regard to resale value later on or just maintaining a clean, manufacturer look under the particular hood, a stealth delete 6. 7 Cummins keeps the truck looking professional. It doesn't look like a project truck; it seems like a well-maintained stock Ram that just happens in order to run way much better than the one particular close to it.
The sound and the smoke
The common worry is whether a stealth delete will make the truck super loud or start forced black smoke all over the place. Since you're maintaining the factory enclosures, they actually act as a bit of a resonator. It'll definitely good deeper and you'll hear turbo charged whistle a lot more through the tailpipe, yet it won't end up being that obnoxiously loud "straight pipe" roar that wakes up the particular neighbors.
Since for the smoke cigarettes, that's all in the tuning. A good, clean melody shouldn't blow smoke at all. When you're seeing clouds of black soot, your tune is too rich. Many people going the stealth route want to avoid that anyway—nothing draws eyes quicker than a "rolling coal" truck.
Could it be legal?
Let's be genuine for a second. Eliminating or tampering along with emissions equipment is usually technically for "off-road use only. " The EPA continues to be pretty strict recently, and in some states, you won't pass an inspection if they catch this. That's exactly the reason why the stealth delete 6. 7 Cummins approach is present. It's the "don't ask, don't tell" of the diesel-powered world.
If you reside in a location along with strict tailpipe tests (where they in fact put a übung in the exhaust), even a stealth delete might not really save you because the chemical output won't match factory specifications. But for these who just face a visual "is the equipment there? " check, it's a popular workaround.
Final ideas on going stealth
At the end of the day, a stealth delete 6. 7 Cummins is usually about making the particular truck yours. It's about taking the great platform plus removing the parts that hold it back, without switching it into a flashy, obvious mod-job. It will take more shoulder grease, and you'll probably spend the whole weekend covered in soot and messing with software program, but the outcome is a truck that's more reliable, more efficient, and a whole lot more pleasurable to drive.
Just remember to take your time with the hollowing process. You don't wish to damage the external shells, or the particular "stealth" part associated with the plan goes right out the window. If you do it best, the only individual who know your truck is erased is you—and maybe the guy a person just passed on the highway while towing 15, 500 pounds uphill.