To celebrate the announcement of Forza Motorsport 3, Turn 10 is offering visitors to its blog a free in-game Audi S4 for the previous version when they add a comment to this post. In addition, those who own the December Car Pack should keep an eye on the store as they will be adding dirt cheap Audi R8s on a regular basis.

Both cars have a custom Forza Motorsport 3 livery and are specially tuned ready for use on the track.

Introducing the Limited Edition Forza Motorsport 3 Audi R8 and S4! [ForzaMotorsport.net]