Yes, dasa exhaust.
Inside the exhaust there is packing. It burns out over time and needs to be replaced. Just go to ebay and search for.... exhaust packing. Many examples will come up. Make sure you get 4 stroke packing not 2 stroke.
I pulled the 08 450 out of storage and went for a ride today. It has been neglected the last 6 years due to having a 5 year old😂. Been use to an xp4 1k for the last few years and the 450 made the RZR feel slow. I think we may have to air up the paddles and hit some sand.