More power with out afc housing had a tuned one on my truck put it on the dyno and put out 514 took it off made 588 that's with no fuel plate on both

 

Did you have it modded for full rack travel? What pump are you running? I ran both with and without an AFC, no comparison, the AFC equipped truck was much more fun to drive, and no worries about killing the bottom end by overfueling it.

 

Yes I have the deep plug n mine for full travel and I'm runing the 215 pump