Used 2011 6.7 Purchase

67Stroke · Oct 28, 2015

Hey everyone,

Getting into the diesel world for the first time and had a few questions about aftermarket 6.7 equipment. My lack of knowledge outside of basic diesel engines will be pretty apparent. Thanks in advance for any info.

1. Other than the obvious legality issues of some states, what negative/long term effects are associated with the removal of the catalytic converter, if any?

2. How can one tell which aftermarket chip enhancement a used truck has if there is one? Meaning make/model/etc.

3. If a truck is chipped, are there usually settings that work best to keep the truck running pretty stock/not put extra strain on the motor etc? Extra power etc doesn't mean much to me if it hurts the system in the long run.

4. Can aftermarket chips be removed and the truck run back in stock configuration just like it did originally? Or is retrofitting a bad idea?

5. Are KN filters still an added benefit? I've seen some mixed opinions and am wondering what the current preference is.

All in all I am looking for a used 6.7 that will last a long time. Durability and longevity are the ultimate concerns as these expensive trucks are large investments.

Thanks for your time.

Cheap6.7 · Oct 28, 2015

Welcome....

Sterling6.7 · Oct 28, 2015

Check out the No Limit intakes. Far superior than anything else for flow. A K&N filter is only good for filling up a trash can or re-gifting to someone you hate.

JMart · Oct 28, 2015

6.7's aren't chipped.

They use a programmer, that reprograms the computer. If it is removed then the truck goes back to stock settings. Usually there are some pids that show up so there is proof that the truck has been programmed, just not what device is used. The catalytic converter isn't the issue on the 6.7. The exhaust filter is.

sootie · Oct 29, 2015

just run it stock. they dont have the same issues that the older ones did with emissions equipment still in tact,,,

TripleE44 · Oct 29, 2015

1 - Its not the catalytic converter like Jmart said, its the Diesel Particulate Filter(***) you remove. Just it being off the truck isn't going to harm the truck, the harm comes when you add power. Just like anything else, you make it go faster and work harder than it was designed to and you take a risk. However, they seem to be fine with a tuner and exhaust. You should also know you need a tuner to be able to remove the ***, even if you run it at the stock power level.

2 - If you're asking if you can tell if it's ever been tuned, you can't. If you're asking how to tell which tuner is on it, there should be a monitor or a device to hook into the OBD2.

3 - Yes, there are generally multiple power levels.

4 - Yes you can return to stock.

5 - No. K&N is out. No limit, like someone else said, and S&B seem to be the most popular.

TXGLASSMAN · Oct 29, 2015

TripleE44 said:
1 - Its not the catalytic converter like Jmart said, its the Diesel Particulate Filter(***) you remove. Just it being off the truck isn't going to harm the truck, the harm comes when you add power. Just like anything else, you make it go faster and work harder than it was designed to and you take a risk. However, they seem to be fine with a tuner and exhaust. You should also know you need a tuner to be able to remove the ***, even if you run it at the stock power level.

2 - If you're asking if you can tell if it's ever been tuned, you can't. If you're asking how to tell which tuner is on it, there should be a monitor or a device to hook into the OBD2.

3 - Yes, there are generally multiple power levels.

4 - Yes you can return to stock.

5 - No. K&N is out. No limit, like someone else said, and S&B seem to be the most popular.