Anyone know which FPR could be used with 255 pumps without needing modification? I'm running rich when not on the juice, due to the larger pump I needed to get when on the bottle. When I dyno tune in a few weeks, I want to make sure I have the right tuning tools so that I could get myself running like stock again when off the bottle.

 

thats what tuning is for . dont you have a vafc or something ?