You have the turbo so you're going to hear things the naturally aspirated cars don't, especially now that you've swapped out the stock airbox and intake hose with the K&N setup. I'm inclined to think that everything you're hearing is completely normal; when I put Adam's full intake kit on my car you could hear all sorts of amazing sounds, including a fluttering noise when driving slowing through my neighborhood and letting off the gas. You probably couldn't mimic the sounds while revving at idle because you can't get the turbo to fully spool - I believe the idle limiter (or whatever you want to call it) won't let you run over something like 3000rpm before kicking in when in park or even neutral.
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