My A5 wasn't much louder straight piped from the turbo back. Then I put it back to stock.IIRC even the A5 PD wasn't much louder with a muffler delete. Remember the turbo muffles a lot of the sound....then you have the CAT and DPF. My sister had an exhaust leak on her ford explorer between the CAT and Muffler (at the rotten flange). Even it was only slightly louder despite a huge exhaust leak there. It actually sounded good to me, but, the leak was on the driver side between front and rear passenger doors..a must fix for safety reasons. I have never been a big fan of really loud exhaust, but I am all for increasing power. On a gasser the loud exhaust will create rattles and vibrations over time. I like looks and performance...but I like to be stealth...you know so nobody knows what kind of power you have until you punch it.