I might win "dumbest question of the day" for this, but here it goes anyway. I have not done any custom tuning to suspension or transmission yet in this game (yes, I'm a noob). My question is......do I have to have the 20,000 fully customizable transmission to do such customizations as changing the tranny's top speed? Don't want to purchase for my Mini unless I have to (trying to Gold the Seasonal Challenge).