Hypertech recently released their new line of tuners called Max Energy. They are now much smaller (about time) and are also internet upgradeable. Their latest release is for the 08 6.4L and it looks to be pretty impressive. The top setting is rated at 114 hp and 188 ft lbs of tq. bringing the rear wheel numbers to 414hp/716tq. They also claim you can tow with zero issues in this setting. The other two settings are: 44hp/72tq and 80hp/131tq. Anyone interested in one let me know and Ill give you a discounted price for some good feedback.