Iv only had my car a week now but there's something that's caught my eye, or ears!! 
In 4th gear only it seems, at around 2000 rpm as your slowly building revs, there's a vibration/noise that kicks in from the back, exhaust I think. It doesn't sound right really.   
I don't know if this is normal or something that needs looking at. It's odd how it only seems t happen in 4th.  
  
Your feedback would be much appreciated. 
  
Thanks