Well, I have to again revert to the test Motor Trend did with the SRT-8. They found that it actually produced 467 hp. From a review I read on the GT500, the supercharger they put in there is for more high end hp & tq. Now considering that a 32 valve DOHC already tends to produce more high end power, I think the HEMI could match it with the fact that it produces more consistent power, flatter hp & torque curve. In a past test I think Motor Trend did, a 350 hp Corvette managed to defeat a 390 hp supercharge 4.6L Mustang Cobra in acceleration. So I won't be surprised if the Challenger manages to do the same. Also, I mentioned this in another post on this forum. In the picture of the 6.1L, in the concept picture, they show a air filter which looks like a cotton-gause (K&N type) air filter. Does the 6.1L offered in the Charger, 300C, and Magnum have the same air filter on the SRT-8 models? If not this will improve it some more and possibly enough to top the Mustang.