My r33 made just over 180rwkw-->cat back, intake, 10psi. Yours if fine...mine is a little high
For that power scrap the list, all you need is the cat, power fc (or a retune/piggyback) boosted to 12-13psi MAX and make sure your intake and exhaust are free-flowing (3inch). Give the car some good oil and plugs (i use Motul Turbolight 4100, NGK copper gapped to 0.8mm). The other mods are only needed for higher power, and the turbo will need replacing in that case. Realistically the car will make close to 200rwkw (depending on condition, i.e fuel pump might be tired). i'd just be concerned if the turbo will reach that power. Good luck