2007 Speed6; Hissing noise?

Laranzu

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2007 Mazdaspeed 6 Sport
Just picked up a new to me 2007 Speed6 Sport with 50k miles. It is entirely stock and unmolested. It must have been owned by grandmas or something.

So its probably new car paranoia, but is a loud hissing noise originating from somewhere near the front right fender normal on a speed6? Only happens above idle. Gets louder in volume until about 3krpm. Happens while driving and while in neutral. To my simple mind its a huge vacuum leak but can't be, as there are no other issues. Seems to be originating from the side of the block with the accessory belt. Its not AC or brake booster dependent either.
 
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