Can number plates make your car faster? No they can't. However, on a daily basis, be it whatever country you live in. There are petrol heads who love to have custom number plates that refer to their cars power. Combinations could refer to the vehicle engine size, the 'BHP', or even what make of exhaust it has installed.
Combinations which refer to a vehicles engine size could be 'V12' or 'V10' and have other characters to go with it, such as the owners nick name.
These type of custom number plates combinations tend to be strictly for the car they are assigned to, unless they can be transferred to another vehicle with similar specifications.
