Get more out of your 3.8-liter 2007-2011 Jeep Wrangler with Hypertech's Max Energy Power Programmer, whether you're on- or off-road. This plug-and-play programmer allows you to adjust throttle tuning and response as well as tire pressuring monitoring and warnings, set multiple idle rpm for normal and low range, calibrate the speedometer, adjust on/off temps for cooling fans, and set top-speed and rev limiters on the fly. Hypertech says it will increase performance by as much as 11 hp and 24 lb-ft. $379.