Ok.
So what you want is.
And this depends on budget too.
Nistune or a powerfc.
550cc or larger injectors.
Larger fuel pump. Walbro or something similar
Z32 MAF
Metal intake pipe
Then better than stock clutch (im partial to os giken)
Then tune by someone who knows what they are doing...once again my preference to take it to yavus at unigroup engineering in sydney (I wont ever take my car anywhere in canberra, but im a fussy prick) others are happy with a couple of the locals.
There arent many highflows that will do 280rwkws on 98 so expect 240-250 at the most.
Now you have a quick car that needs to stop and steer better. So factor in good suspension stuff. A good diff Centre and work on the brakes. New rotors and good pads are enough for most.