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Originally Posted by klapper

The Challenger's reputation has suffered at the hands of magazine reviewers because it's suspension is too soft, and it doesn't feel as nimble as the Camaro or Mustang. That's pretty easy to change with tires/springs/shocks and Chrysler is making these changes.

After the Mustang dropped the 4.6 for the 5.0, it was also the slowest, at least for the entry level v8 trim. That won't change but the 6.4 Hemi will be the top performer in the normally aspirated playing field.

As a final point, a "connected" poster on the LX/Challenger blogs has pointed out there will be 7 engines in the 2011 Challenger, 2 v6s (1 flex fuel), 2 5.7 Hemis (MDS and non-MDS), 2 6.4s (MDS and non-MDS) and one mystery engine.

My guess is the mystery engine is a very limited run of Viper 600 hp v10-powered Challengers.

Aluminum block 6.4.