I finally purchased the 09 and it is in my most humble motorcycle opinion "FREAKING AWSOME" The stock exhaust is rather quiet and does not really compliment the power in my opinion. I'm truly not concerned at this moment with more power, but I would love to make this bike louder. I kept reading about slip on exhaust systems and I did not fully understand what that meant. I took it that you could unbolt and unclamp the rear muffler etc and simply slip a new one on. I see that anything that boasts that "slip on exhaust" means you have to butcher/ cut your stock exhaust. I am requesting as much info as possible about exhaust modifications and what they "ballpark" cost and what it takes to install please.