Home / Make/Model/Year/Engine/Fuel / Porsche / 911 Turbo / 991 (2013-2016) / 3.8TT 3.8TT Gift card $10000 out of 5 $1,000.00 Gift card $5000 out of 5 $500.00 Gift card $2000 out of 5 $200.00 GIAC Stage 2 Plus software upgrade0 out of 5 $2,851.25 GIAC Stage 1 Plus Porsche 911 Turbo 991 ECU upgrade0 out of 5 $2,500.00 GIAC Stage 2 Plus software upgrade0 out of 5 $2,520.50