Yeah It depends on what your goals are for everything. I say if its going over 400hp I would build the bottom end to be on the safe side. But thats just me Builds aren’t cheap if they are done properly. You can get 400 horse from a big turbo but I question how long your engine would last. I did tons of research before I started my build and there is not many people on here that would be any help whatsoever because no one deals with big hp’s. No offence to this site but I would go on skyline forums and Australian forums where guys actually have lots of knowledge with their cars asking a bunch of guys who drive sentras and altimas probably won’t have any feedback on driving or modding skylines.
Talk to GTR dad or something he has a sick car.