ok. the guy who sells it says the SZ can work with subarus. he said the SZ is using the JDM ECU map first then it will alter the map by retarding or advancing the timing using another device. i asked him about JDM and mine are not similar since JDM STis are equipped with twin scroll turbo/header. he said it will be ok. i dont think so. but i want to try it since a friend said it is ok for my setup, and ok for the $. any comments? anyway thanks for the reply. and btw, i am not sure whether it has the 4 settings on it as mentioned by cann (in 2003).