Basically, the reason why the servicing was every 4.5k was because the diff needed an oil change which was expensive. as this was putting buyers off theyve now changed it to every 9k. However through the grape vine, i have heard from some mitsubishi mechanics that things haven't changed much and in all honestly they would still service it every 4.5k.
But if you think about it, its a high performance car and at the end of the day if i had one, id be servicing it every 4.5k anyway, as would i imagine most owners of high performance cars, at least a fluid change...