Could just be a Sport Pack like you can see on many SL55
if you notice on 55 models there is no side vent on the front bumper, while on 65s there is a vent. Chmon TT as many 55s and 65s as youve seen you should know these things.
If you noticed, I said "sport pack" and the sport pack for the SL55 has the side vent in the front bumper as long as the 65 lookalike wheels
like this one:
Never seen a sport pack SL55 in my life here in America.