I've noticed recently that my 01 Audi A6 2.7T sounds like a truck lol...When I drive it feels very sluggish. It's hard to explain what I mean when I say "sounds like a truck" but my best example could be, when you see a large 18 wheeler drive by and the engine is very loud and a small whine comes out..

I apologize for very bad explaination, but can anyone pinpoint an issue? I feel like I am getting robbed by my A6

 

Throttle body boot? Mybe one of the hoses came off the intercooler?