you don't need to change the wheels/brakes etc etc etc
easiest way:
manifold
turbo
intercooler (optional)
injectors (optional)
fuel pump (optional)
BOV (optional)
electronic boost control
boost gauge
other shit i left out
all you do is change the manifold, put turbo on, get lines etc etc done, add other shit if you want like FMIC. Set bosot to ~7 PSI max - as your compression will still be too high to run high boost....
if you want to go all out engine swap RB25DE for DET - half cuts cost few grand, but keep in mind GTS gearboxes are weaker - so you'd need to do the lot if you wanted to run 15+ PSI and expect your vehicle to last
cheaper to buy one in the first place - but not as fun