Hey Matt,
I have an '05 with the supertrapps. I run the comp open end caps with 8 discs, K&N air filter and all runs great. I am going to check my plugs this week upon change out and if its rich, I'm changing up to 147.5 mains. Right now I get 42mpg which is great and the bike runs awesome! Its loud, but sounds good! Never dyno'd this bike yet. If your headers are still stock, dont get a jetkit, you should check your plugs to see if you need to lean the bike out. Make sure your running an aftermarket filter so it breaths better too!