My second VXR turbo sounds like its on its way out in less than a year (the one before that lasted 11 months as well.) Both got very rattly sounding towards the end of their lives.
I've never got to the bottom of it but my car's pretty much constantly running a dodgy AFM as it keeps blowing them within a few 100 miles (TC and EM light) but I can't afford to keep replacing them and they aren't always accepted under warranty as they usually don't put the EM light on permanently.
Could me running various dodgy AFM's long term be having a negative effect on my Turbo? The exhaust smells very sooty so I'd guess the cars running rich?