not sure anyone in PERTH can remap ur MY99 ecu competently. try the usual places.
if not, a good middle-ground sort of replacement ecu would be autronic. around 2.5k installed. remember theres nothing to show when you are remapping ur ecu, and when you need to sell it, u pretty much wont get anything for it, cus its specific for ur car. u'll only lose tuning money and a bit of depreciation if u go for another ecu.