I've always gotten a sign of acknowledgements from fellow 370Z's on the road (and a few ZX's, too). However, the amount of 370Z's that I see in SD are pretty scarce, so in honor of the heritage, I'd occasionally wave or honk at nice 350's that would drive by.
Problem is, after driving the car for 3 months, I never received a response or an initiation of a greeting from the 350 crowd. Figured it was a fluke.
I finally got what I wanted - a sharp looking white 350Z gave a quick flash as the sun was setting when we passed on a residential road. I couldn't return it in time, since I wasn't expecting it.
Wife was in the car in front of me, and she commented on it when we got home.
"Why'd you get flashed?"
I told her it was a "hi".
"Nice 350 - great color. It looked different!" It had a tasteful body kit on it. Funny my better half can now recognize the diffs between the two - and they're both still Z's.
Kudos to the fellow Z owner who also appreciates the heritage!