So much more to race car development than "how much power you get". You probably have have $8kUSD worth of dampers on that car. Nevermind the brakes. Development time and manufacturing for all of the parts specific to that car. Building a race car is not cheap. Building a turn-key dead-nuts reliable race car with full menu of recommended setup sheets and such is even more expensive. While the output numbers and torque curves that I've seen seem to point towards still using the IS38 turbocharger...I'll bet you there are also specific pistons, rods, etc for that engine code.
You'd be surprised at how stock those engines are.
Remember the idea of the race series is to not make it a series of "whoever has the most money, wins" so there's a lot of regular off the shelf parts in there, hence the DSG option vs sequential only.
Engine wise, I would be hard pressed to see anything different past things like crankcase ventilation/windage setup and some sort of baffling in the oil system or even a dry sump set up along with the very obvious stuff, like the intake setup and the intercooler placement which both of the latter take advantage of some pretty trick airflow manipulation. Past that I would bet it's probably a pretty regular CYFB or CJXC with a very production crank, rods, and pistons. The high pressure side of fueling is probably stock, but with a fuel cell instead of a gas tank that has to have adjustable fill levels for competitive purposes, I am sure the pickup for the LPFP is baffled as well.