Has this snake been kept with adequate humidity? When snakes shed, sometimes a tiny bit of their outer nostril lining doesn't come off with the shed, & when that remains, it can impact the sound of their breathing- especially when they're constricting something (because they're breathing heavier). Higher humidity is what I'd try, & also a very close-up inspection of his nostrils, because it can be hard to see.
If you can manage to have a steady hand using tiny-tipped tweezers that enable you to grab the little bit of dead skin that's been left behind, it should remove easily, but if you pull it when it's too dry (inadequate humidity) it will just break off & remain. (Been there, done this- got it out successfully.) Goes without saying that it helps if your snake is calm & trusting also.
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