The body itself, which sits on the current IR-12 chassis that dates back to 2012, looks far less busy and bulky than the outgoing 2017 model. This is due to a number of major changes including a dramatically lowered rear wing, removal of the rear wheel guards, and a lower engine cover. IndyCar also says that the designers were conscious of making the car look good, not just with better aerodynamics, and that some of the design inspiration came from '90s Indy cars.
There are some functional changes to go along with the new look. The car is lighter than the outgoing model, and the weight is positioned farther forward, something IndyCar says drivers were asking for. IndyCar also says that air coming off the cars is less turbulent, and should allow cars to follow more closely than in the past few years. The body will also be able to accept a windshield like one of the ones tested for Formula 1, if one is developed and approved for use.