I'm reinstalling a fmax kit on my ls (blew the motor) and was wondering how to tune the MRL 2 addtional injector controller or if you have to? its just 2 440cc injectors that sprays into the intake manifold threw the intercooler piping. Didn't really see anything on the controller in which you could tune it.

 

you need to take the cover off and you will see a bunch of ***** (pots) that you can adjust for the varying rpm ranges...

if I remember correctly:
there are also two addl. small screws, one is a threshold (when it comes on) and the other is an overall gain. (kinda like a sensitivity)