I recently had my 2004 TDI Quattro at the body shop for some paint work. I am sure that since I picked it up I can hear the waste gate much louder, it's almost like a petrol turbo with a dump valve! Both wings and the front bumper were removed Any ideas what might of happened a small pipe off maybe? The only thing the painter remembers disturbing is a black box under the passengers wing with 2 pipes going to it. The car is completely standard with 60k on the clock, and doesn't seem down on power. Any ideas were to start looking? Thanks!