Vibrating Rear Window Defroster

I put on some h-pipes on my 02 3.8 so its a lot deeper sounding and much louder and ever since when i shift into 2nd or 3rd at atleast 3000 rpm my freakin rear window defrosters vibrate. is there any way to insulate or secure them better??? it sounds like a bee in my back window,VERY ANNOYING

Foam? RTV or something to glue them?
I don't know what they look like so my suggestions are only generic.