This essentially gives players of the older games some additional cars to add to their in-game lineup of rides. There are five cars in total and they're broken down by tiers.
• Tier Level 3 – 2013 Viper GTS
• Tier Level 4 – 2015 Lamborghini Huracán LP 610-4
• Tier Level 5 – 2014 Local Motors Rally Fighter
• Tier Level 6 – 2013 McLaren P1
The rewards are cumulative, so that means Tier 6 will get everything from the previous tiers as well. To get these cars, you had to play and do specific things in the previous games starting with Forza Motorsport 2 on the Xbox 360.
The more points players earn, the higher their Rewards Tier Level will be. Your Rewards Tier Level determines what awards are available to players at the start of each month. The higher the Rewards Tier Level, the bigger the reward they’ll receive each month.
If you are a loyal fan of the game, you should be able to earn all of the cars without any trouble at all. You will be notified of the level you earned and the cars you've unlocked upon logging in to Forza Horizon 2.