Exhuast Rattle

[ermi]

Hey every one, got a little problem with my Kakimoto exhaust. I've got a metallic rattle in the pipes somewhere. It only rattles at idle and when I accelerate and decelerate at around 1500 - 2000 rpm. I've had a look on the forums about it and apparently there is an internal tag that could he causing the rattle? If so where abouts in the pipe would it be? Suggestions??

Thanks in advance