I’ve tried tightening every bolt I can find and it doesn’t help. Is there no fixes for it?
Try removing them temporarily to see if that is the source. The rear section seems to have been the source for all the ones I had.
I bought some header wrap and cut small strips to fit between the shields and exhaust pipe. You'd like to do the same between the clamps and shields...though that might be a bit fussy. You want no metal to metal contact if possible.
The stock clamps aren't strong and will strip of you tighten them too much. You might find some type of aftermarket automotive style that would work without the strips, but even off the shelf worm clamps will help, but they will need to be tightened occasionally. Also, make sure the overrun is bent away from everything, or you'll get noise from that.
I guess you could header wrap the whole pipe and ditch the shields completely, but there seems to be some disagreement on what that will do to the pipe itself.