So lately I've ran into a pretty annoying problem. I've noticed that while I accelerate I hear this very loud clicking/ticking sound coming from the back of my car. The noise is only heard when I hit the gas. The faster i go, the faster the clicking. It's heard coming from the rear, right side of the car. I believe it is either the wheel bearing, axel, but I'm not quite sure.

I recently had it checked out at this local shop and they said it was a driveshaft problem. We replaced the driveshaft, but the noise is still there.
It comes and goes, but is mostly heard when the car is accelerating through any given RPM.

I've heard it could be the CV axle, or something of that nature. Can you guys help me out with this problem I'm having?
(PS 1997 Audi A4 2.8 Quattro)