Ok.. suggestions... let's see...
am going crazy here, but maybe a pearlescent black/golden yellow color?
maybe humm.. try to make the frong grill darker.. unless if you want to make the intercooler stand out more
Not too sure about this... but make everything silver in the car goldendyellow?
And as far as a real german custom plate...
The owner's name is Alex, tell him Rooz sent you.