No need, yiou just did it.
I was busy with a wedding function and was intending to update this today anyway
The thread you linked to is my thread anyway. Like I said, I would keep it honest. i did just that
Still the same is true though -
A partially drilled dpf core, a dpf with a few small holes through it or just a drilled rear face has never smoked, and I have driven my dpf in various states of drilling through at least 8 regens now.
This most recent smokey regen is the first time I've experienced smoke. My dpf is completely hollowed The DOC at the front of the dfp can is not drilled and remain intact This proves that the purpose of the DOC is not just to burn the excess diesel off, but it is an integral part of CO reduction control (among other things)
Just to clarify, if yoiu just drill into the rear face of the dpf to open up clear channels through it, or even drill some long slim holes all the way through it, there is no smoke, and certainly no more than a regenerating dpf would nirmally produce.
There is no need to drill through it completely anyway, just removing some of the rear face is good enough to improve flow.
I think it's clear that a completely hollowed dpf might smoke, a dpf with large holes drilled thorugh it might smoke, but a dpf which was only partially drilled has never smoked. (not more than the regen would normally produce anyway - a partially drilled dpf still regenerates because it still collect some soot as it was designed to do)
Here's my latest on the EGR fix http://www.alfaowner.com/Forum/alfa-...ml#post5089020