Hello. I have a husqvarna 235. I have owned it for 5 years. I use it for fire wood every year. It runs good but loses power when cutting wood. Bogs down cutting. I thought it was the carburetor. Bought a new one. Put it on, still does the same. I read on a blog the muffler could up. Took the muffler off. It was so stopped up I had to clean it with carburetor cleaner. The muffler felt like it weighed 5 pounds. Like I said I cleaned it. Black oily gunk came out. I was told that husqvarna put a cat converter in the muffler. Any way I cleaned it put it back on. It worked fine for a day of wood cutting then it went back to doing same thing. I found out the husqvarna company discontinued the235. They don't sell the replacement for it. They said the muffler off a husqvarna 435 would fit but does not look the same. Will this muffler fix my problem? This has been a good saw and I love the way it works when it works right. Hate to have to buy a new saw.