DOC Catalyst Efficiency Numbers

[Rawze]

also do a thorough egr tune-up including cleaning or replacing the doser injector behind the turbo and IMAP sensor.

The DOC and DPF can be pulled off and sent to a stealers$it to have baked, cleaned, de-ashed, and flow tested for a few hundred bucks. - If you have this done, take pics of their faces before cleaning for some opinions on any buildup and what it might be from.