This is my Dump Valve on my 2002 Audi A4 1.9TDi 130 SPORT.
I changed it too a trumpet dump valve, thinking would get a louder noise. But in end was slightly louder (very slightly) but a different tone . went from a tschhh to a whoshhh. The trumpet one makes a very long note. First dump valve was 1 second long for every gear change (2000rpm). This one is just over 2000rpm but can last up to ten seconds.

 

hallo there, i have the same audi as you have.

please tell me or show me more pictures of the installatio please i am not sure where to install what, and i dont want to mess it up. did you also had the diesel dump valve electronic box? and the electronic switch for the throttle, i have no idea how and what to do.

please help me out