I found an article sometime back out of curiosity they tested 11 different intake setups on a 5.0 and they claimed the sn95 upper actually made like 3 ft lbs more torque and near 6 hp more then the previous h.o upper. This is the article I found online. I am not to sure which is better, but the fox setup looks alot better and gives you more options it seems. I also read somewhere before the 2000 Cobra R made production in testing they increased the upper plenum volume and made slightly more power.
http://www.dssracing.com/v/vspfiles/photos/Articles/efi dyno.pdf
http://www.dssracing.com/v/vspfiles/photos/Articles/efi dyno.pdf