I’ve got one, but the scrap yard will give me $150 for it.
In general, for longevity, you’re just better off deleting and tuning. Barring that, as long as you occasionally drive on the highway the dpf should be totally fine.

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'10 X5 35d- 279k mi, deleted and DUDMD stage 2, daily and tow vehicle
'01 330i- Drift car: SLR Super angle, BC coils- keep it simple
'07 335i 6mt - Sold @ 171k miles- stage 2 daily commuter for 2 years