A snake "shed" includes a little skin in their outer nostrils as well, so snakes may have (usually minor) noisy breathing during a shed cycle but it clears up once
they shed...and if it doesn't, it may mean they didn't fully shed the skin in their outer nostrils, so take a look. Was there noisy breathing after the previous shed?
A snake that's young (growing fast & being fed a lot) can go into another shed in 16 days, that sounds pretty normal...I'd wait to see if there's noisy breathing
after this coming shed before assuming it's an R.I. (respiratory infection) & treating for that, unless you are seeing mucus/bubbles in the mouth (<that would NOT
be normal & you'd want to treat for an R.I.). Most snakes are "hissy" (grumpy) when in shed...totally normal. All the best...