Viper Racing Addons

Is there any addons, patches, different cars etc for viper racing. I saw some posts about better sounds, more AI cars, spotter and have also heard about a viper gts-r? Any links or help would be appreciated

all your Viper racing needs can be found here... http://members.tripod.com/Virtual_Cruise/viper/yahoo.htm for some online racing go here... http://clubs.yahoo.com/clubs/viperracingclub