Had a my96 sti for couple of weeks now. Thought it was standard when I got it except for the very big exhaust. But now i've found a bleed valve and a prova sticka on the ecu which i'm told probably meens it chipped. It drives greet. I wondered what experiance other people had had with this set up. The car has been in this coutry for at least for years

 

See here mate - http://www.jprova.co.jp/english/index.html

They are meant to be good ecu's however they run lots of advance so you need to be running booster on top of optimax minimum.