Poof and Groan!

Hi all,

I'm getting a poof from the intake when turning off the engine. I've not heard it do that before and it's happening all the time now. It's noticable from the outside. Could it be throttle body seal?

Another one i'm getting is a groan from low revs in the belt area, once I'm above 1.5k I either can't hear it because of the noise or it's not there anymore.

Car drives fine and normal, just new noises is all. It's on 30k.
 

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