check it out..

some vids of people drifiting in forza motorsports.

http://videos.streetfire.net/search/forza/0.htm

and a forum dedicated to forza

http://forums.forzamotorsport.net/forums/?

 

another good game for drifting, also has a G in it, is Tokyo Extreme Racer : Drift...

its made by Genki (insert the weird smiley they use) and might not be GT4 or forza in prestige, but def a decent game for only 19$, 17 used.