Audi a4 exhaust issue - sounds louder than expected!

What is your question?

Hi kind people of Repair Pal, I've recently noticed that my audi A4 2L diesel sounds louder than usual. Whenever I start the car the sound of the exhaust is a tad bit louder than I'M Used to especially when driving on the road. Furthermore, when I hit acceleration I feel as of my audi sounds a bit like a loud sports car rather than a normal diesel car. Now don't get me wrong, diesel cars ain't the most quietest however, the noice seems like there maybe a problem with it. 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? 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

What makes this problem better or worse?

It's worse when Im driving up a hill.

How long has your 2012 Audi A4 had this problem?

A few days back.