You can log out of your current game center account in your iphone settings... I would suggested creating a new game center account and linking your new RR account that you are using to it. Then you can reinstall as much as you want without running into any problems along the way.
That's the case with a lot of cars that don't require headers. It says they give 0 weight and 0 power bonuses but when you install the headers they take away weight still.
I honestly don't know what they are worth :x ... i'm interested in non-campaign class R cars that's why i'm selling them. I never race them they just sit there.. lol
Once you race a certain amount of pink slips in one day, the "system" automatically bans you from multiplayer racing as a precaution. You need to send in a ticket and have them review your ban. Once they see that everything you did was legit they should unban you. You can contact them here:…
That is for promo codes. You get them from RR twitter or fb events, or other ways. You put them in and receive cash, gems, or whatever the code is supposed to give you.
Uninstall the game then re-download it and download the update. Mine was crashing too but that fixed it. If your account isn't associated with a Game Center account read this: http://racingrivalsforum.ciegames.com/forum/check-engine-light/help/1118-unable-to-load-1-2-3-read-this
Like OICU said a good way to hit better RTs is by listening to the sound of the lights. If you get the rhythm of the sounds down it really helps with your RT.