i think its more for FI. NA in my thoughts(listen bitches MY THOUGHTS) is using the basic make up for a car to run and go a little extreme with it. i.e pistons for more of a bang, maybe rods for a more strength under hard conditions.more air and fuel and bam u got urself a street monster.
Now F.I. u have to find the right size turbo a good manifold, right size injectors TUNING ! even though NA guys Need tuning but i think FI its a little more critical and plus once u reach u max power with NA thats it ! F.I. u turn the boost up baby !