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I was looking at people at were talking and Green Diesel Engineering Grand Cherokee EcoDiesel (WK2) Hot Tune and it looks great, a few questions:

- people mentioned "Regen" especially when talking about some factory warrenty flash...what is that?
- Is that CDE tune thing still around or is it "illegal"...says it's sold out
- Seem like a no brainer, any reason NOT to do this on a out of warranty 2014?

Thanks!
 

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Discussion Starter #2
I answered these questions myself...and GDE isn't doing the tune anymore and on U.S. vehicles
 

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A regen is short for regeneration. There is a big filter in the exhaust to collect particles of soot. This eventually gets filled up and if let fill too long would create a restriction--think of a clogged air filter, but on the exhaust side. Instead of changing the (very expensive) filter every few hundred miles, the truck self-cleans the filter by dumping unburnt diesel into the exhaust. This burns in the filter and gets hot enough to turn the trapped soot into ash which blows out with the exhaust. This all happens automatically and usually without the driver being aware.

The GDE tune was a very good one, but unfortunately isn't available at the moment in the states thanks to overreaching by the EPA. Lobby your representatives to pass the RPM Act of 2019.
 
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