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I added the 6400D as well a couple of tankfuls ago after watching the review on Deamonworks. I did see an increase of distance between regens from 165 to 190. I drive a lot of short distance so I'm not surprised my regen distances are not as good as nmtruckers.

A week or so after adding the 6400D I had the ECM updated IAW a TSB related to the emissions system. Not sure which action is responsible for the increased regen distance but I am planning on adding 6400D at the recommended interval.
 
I added the 6400D as well a couple of tankfuls ago after watching the review on Deamonworks. I did see an increase of distance between regens from 165 to 190. I drive a lot of short distance so I'm not surprised my regen distances are not as good as nmtruckers.

A week or so after adding the 6400D I had the ECM updated IAW a TSB related to the emissions system. Not sure which action is responsible for the increased regen distance but I am planning on adding 6400D at the recommended interval.
Demonworks has some interesting videos.
 
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