strange exhaust sounds

[jBaMcWk]

hi can anyone tell what is making a grating metal noise on my exhaust when i rev??? might it be my connecter thingy's (sorry bout the non technical term) are all over tightened not allowing the exhaust to flex????????????? HELP ME PLEASE. my cars an 318is by the way.

[cmy_bimmer]

It might be that the pipes r loose from where the muffler pipe attaches to the cat pipe. There's a metal donut inbetween so it might be loose. Jus an opinion.

[Corey Milne]

Manifold or pipe is loose somewhere, if not that you have a loose baffle in your muffler