Thank guys! yes singapore is indeed a very expensive place to live. the current price for a 987 boxster(2.7) is USD$ 156,000! now you know why i am thinking of changing the battery of my car key myself. so does this mean i still have to "map" the key to the car? by doing this myself will it effect the security system? or just simlpy get the battery and change it myself and know that i am $200 richer.