do i need a custom tune?

[lalo]

i have a 2005 f150 4.2 v6 with k&n air filter, davis unifed ignition screeming demon coils 8.5 mm super conductor wires msd & accel spark plug y i´ll instal a flow master 40 series with a 3" pipe

[SCGt94]

Are there additional things that a custom tune would help with? Sure. Do you NEED one? No.

[lalo]

i don´t know if the model is ok for the truck the model is u7151 f150 software revision v.9r11 but always i have it on the truck sent me the code p0171 bank to lean and p0174 is something else i have to do i have a 2005 f150 4.2 v6 with k&n air filter, davis unifed ignition screeming demon coils 8.5 mm super conductor wires msd & accel spark plug & a flowmaster 40 series for each bank please tell me if i´m doing somethig wrong
thank you