I bet you feel even more silly for spelling question without the "S"! If you are running a diesel, you won't hear any difference. If you are running gas/petrol, it depends on your snorkel. My friends here run stainless snorkels with 1J or 1JZ turbo's and they make no difference to sound - the engines sound awesome tho! I guess if your engine is real smooth, you might hear some wind noise off a plastic snorkel.
It is still just an air intake, cannot picture it every making noise other then maybe he is talking about the wind rushing around it, but cannot picture that being louder then an FJ40 in general. Sure he is not talking about the exhaust, some people run the exhaust to exit at the roof line as well, maybe that would be noisy?