I purchased some parts to upgrade my cooling system today. I read a letter in the latest (October) MM&FF that states the water pump was redesigned for the 99 and up Cobra. The upgraded features include less drag at higher RPMs and improved flow for better cooling. Be assured there has been a design change. HOWEVER, I do not see any reason that drag would be reduced by any means. The redesign seems to be the addition of a round plate behind the impeller, making it look similar to a vented brake rotor. I can see how this would improve flow, but I can't see where it would reduce drag. Preliminary driving tests show no difference in the cooling effect, either, but I have not taken the car on the highway yet. I will keep everyone posted as time goes on. I also plan on changing the thermostat to a 160* model when I install the headers.
http://mark8.org/users/Eli/1/wpump.jpg
http://mark8.org/users/Eli/1/wpump1.jpg