You have got yourself a bit muddled up, I think you are talking about Jim Richards' Targa Tasmania 911 Turbo which was in Motor Magazine a while ago, that is just a hotted up road car.
The car in the ad is a Supercup car which has 287KW power, weighs 1150 kg and costs a touch under $250k from your friendly Porsche dealer.
For about $400k you could get a 911 GT3 RS which has 320 kW (435 BHP) at 8,250 rpm with 2 x 30.8 mm dia. restrictors
http://content3.eu.porsche.com/prod/cms/Te...gt?openDocument