By the way, I think I've clarified the whole "Turbo Engine" affair on a mathematical basis
TB2 with 100-105 hp engine can hit 222 km/h
To hit 300 km/h, you would need a 135+ hp engine, not taking the reduced induc. drag from winglets into account because it is a pain in arse to calculate in detail but you get the point.
Thus, it is still an internal combustion one, just with turbochargers
We've seen that TB3 has a 140-ish hp engine option in TEKONFEST İzmir (My post about it is so damn lost in time) so I think Baykar has secured a deal for Rotax 914/915 or is developing a turbocharged engine of that power output.