Here are some sound clips from under the hood of my 2016 Audi A3 Quattro. I recently installed a GFB (Go Fast Bits) DVX blowoff valve and several people asked me to make some sound clips so here it is. All but the last two clips are with the DVX fully open. The last two runs are with the DVX closed. I highly recommend drilling a small hole in the GFB DVX lever and adding some safety wire so you can adjust it inside the engine bay without burning your hands. It's simple and took me 5 mins.