I bought a whole new muffler on eBay, the factory one here was all rusted and front cover was smashed in. Clutch Hub and Rim Sprocket was wore out, Bearing there was wasted, Air Filter destroyed and the mount cracked. Straight from some methheads so I expected it. Those are all small replaceable parts and already have them on order. Going to run my 25" ES bar with 3/8" Chisel Chain, Carb restrictions are already gone so someone knew what was up, should rip once dialed in.$500 is a great price for a 461 right now. Now that they are discontinued the prices for them are through the roof. All you gotta do with the muffler is take the cage out of the inside and open the hole up. Stay away from the dual port front covers, they don't flow any better and just make more noise.