"Sileighty" was a marketed name, everything else was just made up. Therefore S13.XXXX and S14.XXXX sound pretty stupid in daily conversation.
Basically, when it comes to the "fanboy" names for the latter conversions:
The Chassis usually comes first, then they add the number from whatever front end they are using.
Don't forget Sky-via, One-Line (Also a marketed name), and that Z33-180sx-G35 creation, among MANY others.
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