I installed my K&N Typhoon a few weeks ago. I've had no dust/dirty issues under the hood that I can tell
I did the fuse pull for $h1ts and giggles after the install, not sure if I had to or not. As for the sound I think it sounds pretty good when you get on it. I've had K&Ns on my other vehicles with no issues. Never expected my car to be a much bigger beast with one on there either.