Low weezing sounds are not uncommon in BPs. I know this question has been asked multiple times on this site. Actually, mines had the same problem. I mostly heard it when he was very active.

It could be a little leftover skin on the nose from the last shed.

To set your mind at ease, check his nostrils, or around the mouth for mucus or bubbles. If there are none, then it's probably not an RI.
But i'd keep an eye on him just in case.

If there are bubbles or mucus, then a visit to a reputable herp vet is in order.