Webster454

I have a 2007 mustang gt that has like a click sound like a card hitting a bicycle spoke. from the rear i think its always there i just cant hear it at higher speed. Hitting the breaks don't change anything. More noticeable in a parking lot or up against a wall. The car has 4.10s,intake, tune,exhaust,tb spacer,tein coilovers. It seems like as the tire turns it hits that one thing and it makes it click once everytime.