Just assume the answer is yes. Some dealers may be friendly to stage 1 type stuff.. But at the same time some dealers may get you flagged for mods and voided.
So just assume yes.
With that said I have a basic retune on mine because I didn't want a STi tuned by the EPA.
I am not sure the specs on the 13 STi.. It could have all types of fancy fuel injection so it hits EPA numbers without all the hacky tuning..