My PC5 came today so I am ready to rock!  I would like to change things one at a time, starting with stock air and exhaust, but with PC5 added.  Then add my Wings muffler, changing the map accordingly.  Then, with a opened-up air box, and appropriate map.  My question is, what map to use with the stock air and exhaust.  I understand that the PC 5 comes with a map for stock air and exhaust already loaded, so I theoretically don't have to change anything for step 1.  However, I noticed that while the stock air and exhaust map (M18-016-001.pvm) adds fuel in a a lot of places, it also leans it in others.  Since the idea is to lessen the overly-lean factory settings, leaning it still further seems to be doing the opposite.  Should I change the negative values to zero, or are they there for a good reason?

Also, there are no ignition changes in the stock air and exhaust map.  Is it OK to advance the timing 2-3 degrees, or should I wait until I add the Wings exhaust?

And thanks for bringing up the subject of spark advance and octane relationship. I researched it and learned a lot!

Best,