The well known motorsports scam artist KC Webb has come to 4M, and to all people selling cars, parts, etc.., he likes to get your phone number off the ad, and call you to harp about his "sponsorships" and what not if you send him a fee for naming rights or something. It will sound too good to be true, and it is.
His username is QuickChangeGearz11.
Just warning everyone out there.