P.S. You should have seem the smoke coming from the exhaust pipe when it went into a regen before being deleted. I could not see the cars behind me from all the smoke.:)
That's not right. The catalyst wasn't working properly then. DPF regens shouldn't create any smoke. Any fuel dumped in the exhaust is supposed to be burned in the catalyst and in that way heat up the DPF.
Other than a different exhaust note and hotter exhaust, you can't tell a dpf regen is going on with mine, from the outside.