New to the board. Anyway to upgrade my account?

Hey hows it going team and members?
Just downloaded the game after seeing an article on Jalopnik.
Must say, as a car nut I LOVE IT! I purchased the $25 code and realized I'm missing out on all the cool engines and such (V6, V10, V12 etc)
I just wanted to know if there's anyway I can send you guys the $10 difference and have my code upgraded and the old one deactivated? Or would I have to pay the full $35?
Thanks have a great day!
Just downloaded the game after seeing an article on Jalopnik.
Must say, as a car nut I LOVE IT! I purchased the $25 code and realized I'm missing out on all the cool engines and such (V6, V10, V12 etc)
I just wanted to know if there's anyway I can send you guys the $10 difference and have my code upgraded and the old one deactivated? Or would I have to pay the full $35?
Thanks have a great day!