I wouldn't be surprised if thery were under rated a tad for the whole SRT comparison but a different intake on the trucks could mean big difference in HP between the Rams and our Challengers.

As an example, when Ford did the Fox to SN95 body style in 1994, one big difference was the hood was closer to the engine requiring a lower upper intake for the hood to clear the engine. That change cost the Mustang at least 10 HP from the 1993 to the 1994 Mustang GT.