Well im doing 251kws on mine and i was required to do this:
ECU: Either a Nistune, PFC or VIPEC i choose PFC
Exhaust: 3inch all the way with a highflow cat
Cooler: return flow cooler
Turbo: Stock highflow with a .63 rear housing
Ignition: Splitfire coilpacks unless your factory ones are still good
induction: stock air box with a highflow panel filter or pody
Air flow: z32 or a Q45 i choose a z32
injection: i choose to highflow but i would recommend proper ones like nismo,sard 550cc's or so
fuel pump if your one is about to die, change it to a BOCH 040
do all of these and you'l be doing some good power on standard internals.