Those wanting to quiet down their intakes after the air filter change might want to consider using MLV, or mass loaded vynal. It can be applied similarly as dynamat, using velcro.
It is commonly used in many applications including cars to quiet down road noise, so one can listen to the stereo without having to turn it up so loud.
It's available on Amazon and also from
Sound Deadener Showdown | Your Vehicle Quiet You can read about it's applications there. It might be just the ticket to get rid of the crickets and tiny jack hammers some hear.
Hoopla