Grand Prix Story/Cars

You should only sell the cars either when you haven't used them at all on a race and are not useful and when you are really low on money. scrap for research data instead.

(exp = expansion slots, adv = advertising effect, RP = research points required)

If you want to beat all the races and GPs, it is recommended that you ONLY upgrade the Mach car with Platinum and Gold Auras. This could take several times through keeping the Mach as your carry over car. Be patient!