Normal cars can have very few letters/numbers on the numberplate (unless im confusing what you mean with something else?)

Seen a car with BT 1 as number plate
Also you get the numberplates F1,A1,M1
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407BHP and 340lbft
TD GT28/32 hybrid turbo, 3inch decat, 2.75inch exhaust, air intake + large MAF, injectors, fuel pump, tubular manifold