Join Date: Nov 2011
Location: Springfield, OH
According to Hypertech's dyno graphs that I viewed for their product (includes stock numbers), the 09 Hemi (340 HP) has considerably more HP and torque than the 08 (227 HP). The 07 and up 4.7 also has a decent amount of HP (242 HP) than the 06 one (185 HP). The 09 Hemi in our Aspen is quite powerful, and I love the feel when I get on it, so I'd go for that if the difference is truly as significant as those numbers make it out to be.