Perhaps because more power can't be extracted by N/A means due to running afoul of federal emissions. "
Really? I guess that big inch Viper didn't pass emissions? And you don't think driveability and mpg has no factor in the decision to go with forced induction? Ok. Not going to argue as we all have our own opinions.
Now your trying to muddy things up- The Viper is a V-10 because of federal emissions, the same reason they are supercharging V8 packages.
Big wide cylinders increase hydrocarbon emissions around the edges of the pistons. Chrysler (and other car makers) went to "extra cylinders" to reduce this area and better control emissions. Also exactly why piston rings are so close to piston tops now.
The Challenger, Mustang and Camaro are working within the confines of a V8 package. Big cams are not going to pass federal emissions, hence forced induction in an effort to produce more power within a given package.
Look it up, I'm not going to do the research for you. This has been well covered.
