Porsche 997.1 Turbo GIAC Stage 2 Performance ECU Software UpgradeGIAC performance software helps you extract the maximum potential from your Porsche 997. 1 Turbo. Power gains were measured at: 87 wheel horsepower and 87 wheel torque on 91 octane Estimated brake power output of 578 horsepower and 620 lb. ft. of torque Hardware requirements: Turboback exhaust Upgraded intercoolers Other benefits to GIAC performance software include: Improved fuel economy Improved throttle response Factory levels of drivability Raised