I have a '95 ZX-6R. I recently had my header/collector Jet-Hot coated so I had it off. Jest inside the collector is a perforated metal baffle that is shaped like a cone. I think this is what they are talking about. It is probably just spot welded in place. I would guess that the only difference it would make is sound. I still have the stock can because I am looking for a quiet ride (and also one that doesn't draw the attention of the cops). My wife still claims to be able to hear it half way across town when I rap it up.