To keep winning, you’ll need to upgrade your Cars. Remember that the Car you are currently viewing will be the one you're upgrading. To select the Car of your choice, just tap that Car in the Garage’s background.

Tap the wrench icon in the main menu to view the available upgrades.

You may also use the Car Roster tab and choose the car you want to upgrade by tapping on it

Scroll through the different upgrades at the bottom of the screen. Each upgrade will require Cash.

• Nitrous - boosts your Car’s “Straights” performance and allows you to use a Nitrous Boost during races.
  
   
  
  
• Engine - boosts your Car’s acceleration and top speed to increase your "Straights" performance.
  
     
  
  
• Transmission - increases the efficiency that your car shifts gears, helping performance.
  
   
  
  
• Wheels - helps your car to perform on Low Grip surfaces and also reduces the impact of wheelspin.
   
  
   
• Suspension - improves your cars' performance on Rough surfaces and helps Cornering.
  
   
   
• Body - improves your cars' Cornering ability and performance on Low Grip and Rough road surfaces.
  
    
   

Upgrades on higher stages will also require Parts besides Cash.