Well kind of the same concept, but I am going to blower cams over stock PI cams and have heard that specific f/i cams make our cars into a whole new beast.
Thats fine if you are, some of us don't have deep pockets though. 4.6 heads dont flow for shit with a 3.5 inch bore, so they need eleventy billion RPM to make 'em run NA. 3 valve mods and 4 valve mods are a different story though.