Picture of the old engine, but it is the same engine just new now. I believe he sold the original one to another drifter with a 370z. I believe the reason is the shot is to just make instant power to slide and keeping the car NA allows for better cooling and less "issues" during competition.
I don't know all the FD rules, but I know once the competition starts you can call a timeout for only a certain time to 'fix' something and if you do not get to the line you forfeit. So, simplifying the engine/car is key to staying competitive.
