Haven't updated this, but...
k04 installed - DV whine gone (thankfully) - exhaust still very quiet.. at least when revving at a stop lol.
my car has the Rev G dv (diaphragm)
Next mod will probably be a boost gauge, I'm probably going to pick up some nice sticky summer tires too.. maybe Michelin PSS's or Ventus V12's..
we'll see..