I helped change a friend of mines transfer pump on an 04. 5 that had 140000 miles, that got me thinking about my 04. I have 104000 with the original transfer pump and it got me to thinking about replacing mine with a FASS. The only mods I have are cold air intake, high ram, and turbo back exhaust and thought of putting a programmer on it later. I want a basic pump which one should I get and do you remove the original pump when you put a FASS on do you leave it? I know these are stupid questions but please help support a mechanically challenged person. Thaks!