Howdy...
I just moved house and threw out a rusty set of qd32 extractors that proberly would have been perfect for you.
ideally you want to get a complete turbo setup from a wrecked terrano, td27 motor, the turbo setup will bolt on if you get all the right parts...sometimes you can pick this kit up pretty darn cheap, so just keep an eye on gumtree for terrano parts.
Keeping it simple, as above upgrade the air filter, the 80 series airbox will fit with a bit of love and attention. if you dont have the tools to do this, replace you factory filter, make sure its clean and not full of crap.
Change your fuel filter.
Clean you "guaze?" fuel filter, its a **** of a thing located inside the banjo bolt that feeds fuel to the fuel pump.
You may be able to get away with increasing the fueling, this will allways increase HP, but its best done with a EGT guadge installed so you can monitor and adjust as your making the cylinders run hotter.
with the old qd, make sure the accelerator cables adjusted correctly, when i got mine it was verry sloppy and was not getting to full acceleration on the pump. this is easily adjusted.