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does not supercede, the pc only changes the signal that the ecm sends to the injectors. a canned map is the changes made.with the ecm already remapped the only way to know how much change is required is to dyno it,if its already on the dyno aditional changes could be made with the sert, no need for a pc,or u could uninstall the sert then use canned map with the pc, either system is only as good as whos making the map.
the pc is programeed to make changes to a stock map his map is not stock.
If is map has the stage 1 remap you are not correct. There are maps from Dynojet that take the stage 1 map into consideration. Also, Fuelmoto will give you a map for stage 1 downloads.
The OP would have to purchase a PCV. He already has the SE tuner. A change is slip-ons "should" not be significant enough if it's got a good tune. If not, run auto-tune. I respect the hell out of Fuel Moto, but buying a PCV when you already have a SEPST doesn't seem to make a lot of sense to me.