The current ( july 2013 ) Road Bike Magazine is dong a 2 part piece on modifying a 2009 1300r VTX. The first part they add cobra pipes, rejet and add a Kuryakyn
Air Cleaner Kit. The net gain is 6 HP.
http://youtu.be/TBZTPfTeQXk
Air Cleaner Kit. The net gain is 6 HP.
http://youtu.be/TBZTPfTeQXk