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there are actually studies that show that the DPF reduces the size of the particulate rather than oxidize the carbon fully to CO, CO2. The particulate is still present, it's just smaller, less visible and has unknown environmental and biological impact. the body is adept at removing material from the lungs but when the particulate becomes extremely small, its effects are not well understood. I'm not saying removing the DOC is good in anyway but the DPF is unproven. Additionally if the DPF reduces mileage and you have to burn more diesel to get where you're going, the benefits become even more questionable.
My current plan is to yank the DPF and leave the DOC and tune.
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