Hardcore Fiat Abarth 124 GT Race Car caught testing: GT4, One-Make Racing or else?

In the last months this Abarth 124 GT mule has been seen testing at Franciacorta and Mugello circuits. A few days ago I was able to record it in action around Monza and, based on the rumors circulating here in Italy, this could be a GT4-spec car. I'm qu