HP tuning issues with e-torque equipped 5.7

[glauben]

Are there any limitations for either ecm tunes (ie. Pulsar), or bolt-on mods to increase hp performance? I bought the e-torque hemi with the options I sought, but after driving a non e-torque loaner, i can tell a noticeable difference in the acceleration and torque. The e-torque seems to have a little drag, though this has been reported on several reviews.