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I have asked a very similar question and the response I got was that the Lightning concept has 32 valves and I believe that was the setup which produced 500/500. What happens between now and 05 is anybody's guess, but I have read that there is a real good chance 6 speed tranny and independent rear suspension is already being shelved. There are just too many variables being shuffled around for anyone to be certain at this point. However, the three valve head with a more efficient twin screw could very easily make up the HP/TQ gap if they choose to not go with the 32 valve setup....
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