GIAC Stage 1 tuning 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 be performed in-house via laptop through your vehicle’s OBD-II port.

981 S (3.4L)
GIAC Tuned: 327 HP / 280 LB-FT
OEM: 311 HP / 266 LB-FT
DIFF: +16 HP / +14 LB-FT

981 GTS (3.4L)
GIAC Tuned: 350 HP / 290 LB-FT
OEM: 326 HP / 273 LB-FT
DIFF: +24 HP / +17 LB-FT

981 GT4/Spyder (3.8L)
GIAC Tuned: 405 HP / 328 LB-FT
OEM: 385 HP / 309 LB-FT
DIFF: +20 HP / +19 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.