I believe the Ford Racing superchargers are simply Powerdyne units, sold as a kit with Ford's name on it. Also, even if you only add 6 PSI, you are probably still looking at upgrading your fuel system so not to run lean. I wouldn't buy that kit, but instead build up my engine for the money. H/C/I can put you at similar type performance levels, and like said above, I am impartial to motor combo's as well.