Hi Guys, 
The CAR: I've got a mk5 GTI 55plate DSG 66k miles. 
Problem is excessive noise - It's recently become more noticeably more louder from what sounds like an exhaust sound which increases upto 70mph then goes away  the sound is so loud.. that  only a stereo can drown it out  when the speeds are in the 60mphs.
I'm a bit baffled as an inspection of the exhaust under throttle has revealed no holes.  could it be a bearing? 
Any pointers would be much appreciated.
Cheers, Jaz