the Dobeck comes preset with factory A/F built in.
You can add fuel to it, or lean it back to "stock" ,
or even take the fuel mixture "down" past stock
to lean it completely out if ya wanted to.
So, contrary to popular belief yes Virginia, you can make it leaner.
Now NOT with the generation 3.0 (the one with screws).
But with the generation 3.5, you can subtract fuel from the mixture.
As far as the superiority of the PCV over the PC3 or Dobeck,
I'm sorry to inform all the guys who bought one
that it doesn't really do what they advertise it to.
At least not in "run" mode or in real time.
it only "learns" what your air gases say in the learn mode,
then you're suppose to change it over to ride mode, correct?
At which point it quits sampling the A/F gases and uses the stored info
and applies it to all your riding conditions, idle, cruise, and WOT.
So it's not really an auto tune at all.
basically a glorified PC3 with a learn mode.
Same as the Dobeck for a lot more money,
but hey, it's only money right??????