Both our TFI and GEN3 controllers will work with or without a stage 1 download. With typical stage 1 modifications where the air flow is increased on already lean bikes we have to add quite a bit of fuel to achieve your max performance from the modifications. If you go ahead and have your ECU flashed with the stage 1 download this basically richens up your entire baseline fuel map. However, in most cases it is still not enough and our controller can help fine tune your vehicle.
Our controllers do not "override" the ECU. Our controllers are grouped into what is called "piggy-back" controllers. We monitor the incoming injector signal, make our calculations, and then modify the signal sent out which actually fires the injector.
Bubbie, give us a call.