I'm guessing that "loud" means a lot of wind noise if you are suspecting the fan. What kind of fan are you running?
Also, I use to run an open element air filter and there was always a lot of intake noise.
I took the base off of a Mark VII dual snorkle air cleaner, removed the snorkles and use the same open element filter & lid as before and the induction noise was cut down dramatically. No more "whistle".
Governments are extremely dangerous.
Death, imprisonment, theft of property
and loss of freedom will result from
giving them too much power.