Shop for parts that range in quality between 1 to 5 stars (5 being the highest).
Note that you cannot build cars you already own. If you receive parts for a car you already own you will automatically keep the parts instead.
Spend Premium currency to earn a Lucky Diamonds. 7 Diamonds guarantee a 4-5 Star part.
Lucky (green) Clovers are earned by competing in League and Club events or can be won from daily rewards.
Clovers are used with regular coupons to increase the chance of getting 3-5 star parts.
Trophies will guarantee you a 3-5 star part and can also be used for the chance to buy ChoroQ or KIA parts.