To get the Hellcat in Real Racing 3, you need to follow a few steps. First, you need to reach Tier 15 in the Pro/Am category. Once you reach this tier, you will be able to see the Hellcat in the car dealership. However, you will need to have enough in-game currency (R$ and/or Gold) to purchase the car. If you don't have enough currency, you can earn it by completing races and events in the game. Once you have purchased the Hellcat, you can then upgrade and customize it to improve its performance and make it uniquely yours.