H3 Hummer Performance Package! This Hummer H3 Perfomance Package consists of a Magnaflow Dual Cat Back Exhaust System specifically made for the H3 Hummer, the AirAid Intake System and the PowerAid Throttle Body Spacer. This kit can be installed in your garage with basic hand tools. Complete instructions included. Add some much needed extra horsepower by helping the "Breathing" in and out of your new H3.