And see, that's what I keep saying, there should be really no comparison of the SRT-8 to the GT. It should be apples to apples. Mustang against Challenger SE, Mustang GT against Challenger R/T and Mustang 5th generation xft supercharged Shelby/Cobra/Salene/Gone in 60 Seconds with Bullit in the background against Challenger SRT-8. Really don't know what to compare the SRT-8 to in the Mustang line after the GT to be honest because there are so many dang versions.
Again, only paper to paper comparisons, not real world tests, here's where I got the 4.9 for the Mustang GT:
http://www.i-ford.com/images/2007%20Mustang.pdf
Page 2.
I'm not able to find 0-60 times on the Dodge website for the Challenger and of course there is no brochure on the vehicle yet. I've seen many websites that say this or that, usually low 5, but nothing from the offical website, at least that I can find.