240SX names??

I was reading the Compact Sport today. There had an article about the Drift event of D1. There was names of the car. I saw the 240sx. The 240sx had weird names. I wanna know what does RPS13 and RS13 means???
Im going to get a custom plate.
what should i get?
My choices:
DriftSX
RPS13
S-13

hahaha, thats a funny joke

...oh, you weren't joking

read the 2nd post in this thread http://www.automotiveforums.com/vbulletin/showthread.php?t=171956

and i bet you anything those license plates are taken lol...where are you located that might give you a chance of getting a custom plate....i rather have my name on it then the chassis code.

oh.....my.....


closed.