It’s got nothing to do with Corvettes.
“Two fingers down” is a greeting that says “Keep the rubber side down”.
It’s a wish for safety for the other rider.
Corvettes aren’t “rare” enough, IMO.
The local weekly car show is lousy with them and they hog space that would be better used by real Detroit muscle.
Bikers don’t do “elite”.
Thanks for the explanation. BTW, in my day in the late 50s and early 60s, Corvettes were somewhat rare and I think a thing of beauty (except for the 63 Corvettes with the split rear window)....