does a sd hpop give a hp boost or is it just a supporting mod for injectors

 

Mainly its a supporting mod. If you constantly set a CEL for low HPO Pressures then you might notice and increase in power. I noticed the difference when I installed mine. THe midrange and top end pulled harder, longer.

 

you just follow rubberduck's directions an d it's a breeze. one thing though the torque on the bolt for the gear is 95lbs. instead of 160lbs. i really had to crank a long time to get mine to fire up, but it finally started. i got my pump from area diesel in carlinville,il cost me $408.