This was given to me by my car's previous owner; by consensus it seems to be a 4AG 88kW Bigport MAP ECU. Have a look at the discussion in the Tech section of Toymods confirming this:
Mate i'm not having a go at the price or anything here but just to let you know I did buy a complete 4age engine (120,000km old) with ECU for $250.. so if you want a speedy sale you might need to re-think the price... but again i'm just saying that to help you out, not to have a go at you!