Ati Iqbal

Hi Community, I've recently noticed that my audi A4 2L diesel (134K on clock) sounds louder than usual. Whenever I start the car the sound of the exhaust is a tad bit louder then im used to, especially when driving on the road. Furthermore, when I hit acceleration I feel as if my audi sounds more like a loud sports car than a normal diesel. Now don't get me wrong, diesel cars ain't the most quietest however, the increase of noice seems like there maybe a problem with it and I would like to know what this may well be. Also I've noticed the sound itself is emanating out of the exhaust (rather than the engine) in my opinion. Do you believe there maybe a leak somewhere that could be causing this increase influx of noise ? Also, when I drive and put my car in neutral I've noticed the loud (sports like) noice stops and it seems normal again. May I ask, is this something I should be concerned with? Please help guys... Any clues to the resolution would be hugely appreciated. Thanks Ati