The price for a 2019 Mustang GT with 31k miles at $35k seems pretty reasonable, especially if the car is in good condition. You might want to compare it with similar listings in your area to be sure. As for upgrading the infotainment system, it depends on how fancy you want to get. Basic upgrades can start around $500, but if you’re aiming for something high-end with features like a bigger screen, Apple CarPlay, or better sound, it could run you $1,000 or more.
A 2019 Mustang GT with 31k miles for $35k is a great deal. Upgrading the infotainment system can cost anywhere from $500 to $2000 or more, depending on the features you want.
Research your options and choose what best suits your budget and needs.