Try to find out if there's a 6 speed transmission that'll fit on to the NZ-FE. Also consider an LSD. For suspension, pick items from tein, HR, Eibach or Bilstein - depending on what kind of setup you want. Ideally, go for adjustable damper force and ride height, will make life easier in Pakistan.
Lastly, consider items such as short shifter kit, CAI, P headers, larger fuel pump, rail and injectors. They may not help dramatically with the performance, but definitely increase the responsiveness and 'feel good' factor when your pushing it. At the end of the day, that's what really counts.