I really wanted to keep the shorty exhaust but was looking for a little more performance. I don't need a fire breather at this point as I've been riding 250's and 290's the last couple years. The Endo removes the secondary stock cone and I had considered removing the primary cone while I was in there but decided that I can do that later if needed. I can tell you that it is MUCH louder! I only ride moto so it's not a major concern. I haven't had a chance to ride it yet. I will be going to an indoor facility next Thursday. The other thing I liked about the PMB was the tune-ability aspect. I can run it open, with the provided secondary cone, or cone and sparky together. I also have the option of adding a megabomb header down the road. I'm looking forward to riding it and I'll give a report next Thursday night.