Create an account on IM and throw the details in to http://www.importmonster.com.au/estimate to see how much it'll actually cost to get here. I assume you understand it, but Import Monster is a 'Proxy bidding' service for YAJ [Yahoo Auctions Japan]. So they bid on the items, if they win the auction it'll rock up at a warehouse in Japan owned by IM, then they put a new address on it and stick it in the post & it rocks up at your house. Any how, that $348 item ends up being ~$530 when it arrives at your door, by my estimates at least.
10 business days is a safe time frame to say something will arrive from Japan (by air, of course), my ECU took less than that to arrive and Ive heard similar time frames from other people.
OBD refers to a standard communications protocol used by car manufacturers. Its kind of like USB for cars, the plug is near your left knee if youre sitting in the drivers seat Our Stageas have an interesting dialect of OBDII though, they dont like talking to most OBDII readers - but the Greddy Informeters work a treat!