GIAC Stage 1 Plus adds horsepower, torque and more throttle response throughout the power band. This calibration is compatible with vehicles that have no other upgrades to basic “bolt-ons”. Addition of a BMC high-flow air filter and exhaust system will increase overall performance.

Tuning is performed in-house via laptop through your vehicle’s OBD-II port.

991 Turbo
GIAC Tuned: 595 HP / 595 LB-FT
OEM: 520 HP / 487 LB-FT
DIFF: +75 HP / +108 LB-FT

991 Turbo S
GIAC Tuned: 600 HP / 600 LB-FT
OEM: 560 HP / 553 LB-FT
DIFF: +40 HP / +47 LB-FT

HP and Torque figures are average engine estimates derived from wheel power and acceleration testing. Figures based on 91 octane fuel. Use 93 octane when available for optimum results.