How many miles you have on your 6.4 PSD
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Well you have two options (1) buy another DPF (2) but a tuner with dpf/delete
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My father has a 2008 model, 60 000 km or so, no problems. He had the DPF delete and a Dash DQ tune put on the truck when it was less than a year old, and it's been great ever since. It was horrible on fuel, (around 12 mpg) and now gets low 20's. I hope the 6.4 is a good engine, I've heard stories about some blowing up.