and what is wrong with that??
to get to 300rwkw (400hp ~ish) give or take 20kw all you need is a nistune after installing bigger injectors, bigger turbo, FMIC, 3in+ exhaust and boost T..
The other stuff is more to make it more reliable or if the stock parts are stuffed.
The main thing that will make the power goal is going to be turbo. A GTX3076 will make 300rwkw but so can a GTX3071.. HKS turbo mentione above might not make 300 but it sure will kick the other 2 in acceleration on the street. Hi-Flows also might not make 300kw but they make a nice quick 250ish kw which will be fast on the street.
If your mate really wants to crack 300kw then i would not get FPR, head gasket, head bolts and Bov and get a 6boost mani+external gate with a GTX3076