Very CPU dependant game ...
Patches are now a community issue (Mainly on gom-team.com, although the owner is a right arrogant tosser)
Many, many, many pieces of custom content for download, some pretty decent stuff (google Magnum Force if you like a lot of muscle cars
Not much I can say really other than I can waste hours building, racing and crashing my creations !
Oh, and using the script editor so I can put a V12 in a hatchback is fun !