Originally Posted by Cuda340
You may have a very long wait for the 6.4. The rumor is that Chrysler could not get MDS to work on the 6.4 and is now working on a 6.5 engine.
The 6.4L IS STILL in the plans for 2010 model year. NO 6.5L in the works. MDS development continues on the 6.1, no immediate plans for 6.4L MDS.