All cars may be equipped with a variety of upgrade parts to enhance performance over opponent vehicles and AI vehicles. Upgrades also increase your car class which restrict cars to certain races.
Defeating any NPC racer with a player owned car has a chance of dropping an Upgrade Part. Odds are detailed below.
Purchases can be made also at the Red Shade Games Premium Store
Upgrading cars involves a car gaining experience and clicking the appropriate plug sign next to the Car Attibute you want to improve. All cars begin with 1 initial advancement you can use so you can select and add an upgrade part(if available). Any improvements add a 1%+whatever upgrades you add.
To attach an upgrade part, after adding a slot, simply click “Add Parts” in the appropriate slot and select the car part you'd like.