Our performance tuning for the 2006-2012+ Hummer H3 typically yields 10-14hp and 1-3mpg (stock vehicles, more if modified), as well as better part throttle response, towing, driveability, and more pep off the line. We can also account for any modifications you might have. Our tuning supports both transmissions and all year models of H3 including both five and eight cylinder SUVs & Alpha Trucks (note, 08+ Automatics will have a transmission control module also, if sending in your PCM please include this. This is included in our core price if ordering the core program). After placing your order, please fill out an order sheet for your vehicle (here). What program should I use and what is refundable? Click here! Express shipping only covers one shipment for loaner programs.