Within the new Forza 4 is included a fantastic Autovista mode which allows you to explore some of the games luxury sports cars.
But also included in the game is Halo’s Warthog vehicle which can be
viewed in the same Autovista mode alongside cars like the Bugatti Veyron and Ford GT.
Unfortunately you cant currently drive the Warthog in races only view
it in the Autovista mode. Watch the video after the jump to what you
can expect once its unlocked.
To enable the Halo Warthog you need to
pass challenges, within the game. Once you have completed all of these
challenges, around 20 races you’ll then be able to unlock the Warthog.