I had never heard of the GFORCE chip so I did a little search...
This is straight from their site, I doubt there claims of 60hp however...
EASY INSTALLATION. Installation can be performed by anyone using simple hand tools. The GF module installs into your FORD MUSTANG's engine bay and is connected via 2 wires that plug into the IAT sensor. Diagrams are included. The unit is then able to reprogram the ECU thus improving your car's performance. Everything needed for installation is included in this kit for a quick and easy installation that shouldn't take more than 15 minutes. There is absolutely nothing else needed to have this installed on your vehicle
The IAT (Intake Air Temp) sensor is located on the lower intake on one of the runners, location depends on what intake you have.