What part of Philadelphia are you driving around in? Whenever I come across an R I honk, roll down my window, and wave--it's always been reciprocated. Sometimes conversations actually begin as we're driving down the street, once as we were circling City Hall.
People on MK7 Golf Rs dont wave, I just got made fun of today by the gf for trying at least 3 times the past week and getting nothing back.
I always throw up a V to any of the faster VWs out there. People with base model dubs, don't seem to understand so i don't bother.
I'm not a friendly person so i don't wave.