Backbox Rattle

[polo750]

Hi,

I put on a new backbox onto my polo, after a few weeks it started sounding like this:

https://www.youtube*.com/watch?v=6cZiBrkaF6s
https://www.youtube*.com/watch?v=C9i_kcl0-lc

WTF is that rattle/echo sound coming out of it? The box is secure, heatshields all ok so im guessing its the box itself?


So im looking for another box, what do you guys think of this one-

http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... %26otn%3D2

Cheers