Re-chipped ECU will cost you between RM1000-1400 depending on what engine wiring you are using, how much extra wiring is needed and where you do it. About RM400-450 for a modified (for add-on chip) EG ECU and about RM300-500 for a racing chip, depending on type. Other charges are for wiring and labour.
For 96-98 engine wiring, all that is needed is a modified EG ECU and a cloned racing chip. For 99-00 engine wiring, it will cost a bit more due to extra wiring/adapter.
Quite a few shops do it. Amoil in Sunway and Superture in Gombak are ones that I would recommend because I've seen the quality of their work.