All my friends call me first, see if I can't find the car they want for them. If I can't, I call the GM @ the Acura dealer, he looks for me.
If I go with my friends, they let me do the talking. Salesmen tend to default to the sales manager though, because I'm just as aggressive as they are. If I'm going out test driving, I act dumb as hell, but like I've got all this money to blow.