Leave it blank, or use a small badge. It looks like a billboard advertisement for Lotus with the letters sprawled on the back. Too much like a MUSTANG GT. Better to keep those who dont know what it is guessing, and those that are into cars will already know what it is.
Actually, when I was at the factory, that was supposedly being discussed. Seems like the concensus in America is that we all want the lettering. Seems someone at lotus wanted the badge. So they are trying to negotiate, or possibly, include both somehow. Still in the works!