Did some work with one of these last year. It had been bastardised with some sort of home made chassis/body kit with 2 front wheels.
They'd tried to seal the poor welding on the tank with a kit but the stuff either never set properly or reacted with our new fuel and clogged up everything. Took a couple of fuel pumps and clean out attempts but got it running well in the end.
Have fun.
Cars normally raise the idle a little when the regen is happening, can't comment on a show blower.
I'd bet that engine is fitted to other vehicles, could be worth finding out for info.
It will as it has pressure sensors seeing how bad the filter is blocked so it knows when to regen.
Easiest is a chemical from Wurth you can spray into the DPF and run the engine, works a treat.