Like I said-efficiency could be better, poor construction on the baseplate eating the ADBV (and potentially blocking flow through the filter, which could be CATASTROPHIC on an engine without an external bypass). I run these on the GMC in my sig, and I have used them on my Cummins in the past, they are one of the toughest built & heaviest filters I've seen, outweighing even FG Stratapore filters, but they're not perfect.