All EFI systems are the same........meaning that within the capabilities of the software and firmware, it does what you TELL it to do. All these guys that say so and so system does everything so and so system does, for 1/3 of the cost, are simply incorrect. It doesn't work that way. You kinda get what you pay for. Be that the quality of the components, the capability, the availability or most importantly......TECH SUPPORT.

On the throttle body stuff........they inject below the blade or above the blade, everything else doesn't matter. Just depends on which method you want or think works best. The other things, controlling timing, tune changes, etc, are simply based on what the ECU can do with the supplied firmware. Some systems are more limited than others...........as was mentioned with NOT being able to change the tune in the Atomic or the EZ EFI.