If no headunit and speaker then need to add both.. But warranty might void if need to modify the wiring..

For speaker might need to drill thr door so can mount the speakers.. Perhaps can go to any acc shop to survey first..

Survey dulu amoi, jgn pasang dulu..

If no speaker panel in front then they will cut the door panel sis.. only rear gor speaker right?

You can try this perhaps.. Install a full range / wide band 2 inch speaker for front and 6.5 midbass for rear.. nowadays got local brand full range speakers too which cost you less and its plug and play..