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Originally Posted by JRS

...If the '07 model is a slightly larger engine, I may wait to see and get this instead...

There is no such motor as a "6.4L". The "newest" Hemi is a 392 cubic incher that is being sold and marketed in crate form only. It is rumored (and only a rumor) that the new 392 will make its way into the 2008 Challenger. At this time it is NOT a production-ready engine.

The 2007 lineup of SRT-8 vehicles will all feature the current 6.1L Hemi engine...