Looking for some direction here. I have an 09 and you all know it sounds like a sewing machine. I dont want to do a whole exahust cause i like the 2 to 1 to 2 look. I am considering the cycle shack slip ons. There is a 2 1/2 and a 4 in. there is about a 3db difference. Not sure which one to go with and im sure i need some type of fuel pak. Not sure which one will work with them and cycle shack has no recomendations on the topic.