Sometimes I see cars with Transformer or Decepticon stickers on their hood or on the side of their cars. Is that just some dude(s) who does that cuz they think it's cool, or is how they affiliate themselves with their race crew. Also, is "SiR" a race crew as well? Anybody know?

 

I don't think SiR is a race crew. I think it originated from the Civic SiR in Japan. The auto.. and decep... are both racing crews. But everyone copied them now. I've seen some cars with both.