GT3vsGTR

Recently acquired 2018 AMG GTR. Has downpipes, carbon fiber rear diffuser, high flow air filters. >$200K MSRP. Runs like a beast but I have no point of comparison. Bought it from a dealer that has no clue on the provenance car - in fact didn't even realize it had full PPF, downpipes and the other goodies. I would bet the car has a tune but is there a way to confirm this?
Konrad