Matt
Electromotive have a website:
http://www.electromotive-inc.com
Also, Steve Weiner @ Rennsport Systems has put together some really useful info on twin-plugging options at:
http://www.rennsportsystems.com/~porsche/2a.html
http://www.rennsportsystems.com/~porsche/2f.html
Steve is the man on ignition...
Your usual problem will be the Australian Peso. Just be glad you aren't a Kiwi. Electromotive looks like it needs a crank sensor arrangement (and the alternatives for sale are absurdly expensive), two ignition packs and headwork to accept the extra plugs. It will be pretty expensive...
Lots of research if you have the time!! Good luck.
Cam