I'll play
AAM kit has less than ideal pipe routing. for instance, look at that 90* turn the boost has to make before entering the intercooler passenger side. Or how close the intake pipe is to touching the the turbo manifold. Or how about those couplers on top of the intercooler. Too many bends and turns. It looks inefficient.
Now go look at FI. Everything has smooth transitions. And both sides passenger and driver...looks equal length and mirror image of each other