Now that Forza Horizon is free for Xbox Gold subscription members, it's time to nab some cheap DLC packs while you can.
Contents of each DLC pack paraphrased from here.
- Season Pass - all monthly DLC car packs from October 2012 to April 2013. It also includes the Rally Expansion pack.
- Rally Expansion pack - Entirely new mode, featuring dirt tracks and navigator (voice only). Also includes 5 new rally cars. Do not buy if Season pass was already bought.
- VIP membership and car pack - originally a code from the Collector's Edition of the game. Aside from time-sensitive incentives, this includes 5 cars.
No Xbox Gold subscription membership required. Game and its DLC is playable on the Xbox 360 and/or Xbox One.
My review of the DLC packs -
Just get the Season Pass. It includes over 50 cars, plus the Rally Expansion pack - which I think is a great addition if Dirt is too much of a hardcore rally racing game and want something arcade-y. It's short, but justifiable for the price which the expansion itself used to go for $20.
Unless you REALLY want those 5 cars in the VIP Membership and Car Pack, I'd say skip it. Compared to the Season Pass, it's worse value for money.