$300 seems awful cheap for a muffler that is Titainium compared to the rest that are out there. On the other hand that is great that you can get a Titainuim muffler for $300. I saw it in the 2006 Parts Unlimited book this morning. We are tearing into mine next week and I saw that the exhaust cam is retarded one tooth on the WR compared to the YZ. I'm racing the bike so I want it to haul. Anyone retarded their cam and liked the way it did. I'm racing in the woods so I think it would be better left alone but if it will help the bike I'l change it. The free mods were done by me yesterday. It runs better. Now I'm looking for more power. You guys that race your's, give me some ideas.