Removing the silencer ring is just a noise gig.
Its "performance benefit" is the equivalent of indexing spark plugs on a gasser. Indexing is when you put each and every spark plug in so it protrudes the exact same amount into each combustion chamber, and also so that each plug is positioned the exact same "throwing" the spark in the exact same, most effective, position.
Indexing the plugs will produce more power, perhaps . 0005 HP. same with the silencer ring. Air flows fastest on the inside of a tube anyway while the air on the walls is barely moving in comparison. The "fast air" is in line to be sucked directly into the path of the impeller.
Its a silencer ring, plain and simple. Its not going to add or remove any measurable HP or performance, its only purpose in life is noise supression.
If you take it off, leave it off. Trying to re-instal it, you might not get it seated right and it could come lose and eat into the impeller blades. Just a thought.