Ok go to the front page, here ill give you a link www.gtplanet.net, now go to the section under Gran Turismo 3 saying "Prize Cars". When you get there click on "Professional League" and when the page is loaded look for your desired car, it is such a good prize car list...you should use it
Oh and the Pagani Zonda Race Car is won from the Professional Italian Avant Garde and also from the Professional All Japan GT and also the Rome endurance race .
Welcome to GTPlanet, mariosimas! Have a read through the stickied Read This: threads at the top of each board. They usually contain answers to most of the frequent questions.