If juz speaker no need unless u wan better sound... for normal listening it's more than enough from the original HU. If u have budget and wan better sound quality, get a component system and an amp, if wan better bass can install 6x9 at the rear for extra bass. i recommend u blaupunkt GTA-480 4ch amp or Boschmann amp, these r available in a lot of place, for starters these amps quite ok. The speakers juz go according to ur budget la, Boschmann quite cheap and quite gud for starters. Hope this help.

wuakaka, if u planning to install a cheap set of capalang speakers, i dun think it will be much use with amp, yea maybe slightly better than stock speakers. From my experience, i did big mistake and wasted money by installing lousy speakers up front, a capalang 6.5" midbass + a fake focal tweeter. i recommend u to do a mounting job for 6.5" up front, like i did with my own car, it was 5" originally, just add a piece of wood customised to ur door panel, i think most installers can do dat. For me 5" speakers not enuf kick for me. Unless u r ICE fanatic, get a set of component system up front that cost around  rm1000. I saw a few forumer selling branded compo at less than 1k. get a 4ch amp and power the front and rear. If u dun plan to change ur HU, i think any compo system around 500 will do for u, cos HU very important in ICE, a lot of diff. For the rear speakers, i dun recommend u to spend too much on it unless u wanna show off. 3 most important stuffs in setting ur own sound stage, 1st $$$, 2nd A piece of gud HU, amp and front compo sets, lastly a gud installer that will advice u nicely on how to set up a nice system according to ur budget and car. PM me if u wanna know more, will be glad to share info and make new friends, cheers.