Item received yesterday.
Plugged it in and went for a spirited ride.
Backfiring is virtually gone (my main goal/objective). I did manage to get one lil pop going down a long hill. Has stock muffler and Y-pipe. Motronic has the "Steptoe Jumper".
Acceleration has a more linear feel.
Idle is better. Often before it'd stumble and seek. That seems to be gone.
I didn't check the jumper but I'm assuming it is at the 20deg position which I seem to recall stated somewhere how'd be delivered.
Thanks Poolside and JJ. A bike I've liked a lot, I like even more now.