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Particulate Filter's are EXPENSIVE
A whole new DPF cost close to $3500, you can find a non-oem maker that makes one for approximately $1500. Even calling around to the junk yards, a used one would be $1,000. Even if he found a used one he would need to pay another $350 to have the various smoke flushed out of the old DPF just before he could be able to use the item.
A little guidance to all the you Sprinter operators around, care for your DPF, complete all the planned regeneration rotations and get it emptied every so often, or else, your facing a good wad of money to find a brand new one.