I have a 2008 Ultra Classic that after doing extensive research, decided to do a stage one upgrade to. I installed an Arlen Ness Big sucker high flow air filter assembly, Python Slip on Mufflers ( nice sound) and a Vance and Hines Fuelpak. I am very pleased with the bikes driveability. It runs much stronger and a lot cooler than before the upgrade. I like the fact that the Vance and Hines Fuelpak plugs into the factory harness using a t-tap and is easy to setup. My choice of the Vance and Hines Fuelpak was based on:
Easy to install inline with computer
Easy to setup with out needing computer
Don't have to touch injectors or oxygen sensors
This system adds and takes away fuel.
**Also, I have heard stories about bad customer service in regards to Vance and Hines Fuelpak and from my experience, I emailed them a few times over the last week and they answered my questions with no problem.