i gatta problem i think?

when i take off in first gear, i hear a klinking noise underneith the rear part of my car, like the hangers for my muffler are loose, but when i checked it, they were fine. does anybody know what might be the problem?

 

a clanking noise? rear axles? or brake pads low? what about your bpipe? the last time i heard a clanking noise, my dam caliper came loose...dont ask how it just did

 

it sounds like my exhaust pipe is swaying back and forth, and hitting something?

 

how long was this happening for?