a copper aint going to look your vehicle record and see that it is a non-turbo, or and RB26 bla bla bla.
They will seach your plates and see "Nissan Skyline", nothing else. A police officer is not going to be able to tell that your car is a factory non-turbo just by looking at the vehicle record, nor will they be able to tell the difference between and RB26 and an RB25 non-turbo, expect for the few police officer's who may have some mechanical knowledge....