This is what Boba wrote when I asked the same question a few weeks ago:
heres a few pointers for people wishing to update the "out of the box" graphics.
thanks to tarzan from high gear
GPL add-ons in all shapes:
[
gplpp.com]
Carsets, program to install them:
[
www.netrevo.com]
Cars must be GPLAIM compatible - many are, also JFcarset which is a std. car update. Pretty big downloads each car update cause you get all parts available, from skins to chromed exhaust pipes, several wheel types may be - then you assemply your own car with the program!
Track-database:
[
magnust.d2g.com]
Tracks updates for the default ones:
[
www.fredfaster.racesim.net]
Sounds:
[
www.grandprixsounds.racesim.net]
[
mywebpages.comcast.net]
[
forum.racesimcentral.com] - helps you decide which to use, very important in GPL!
Much of the above and some more like track/cars/beginner-guides, the home of GPL if it has one:
[
www.racesimcentral.com]
Just the GPLCSM program links to many more so no need to list them here. But this will get you started. More complicated than just copying from cd, but not much really. Good idea if you are aware of the way files are organized in the GPL folder + subfolders.