Audi TT RS 2.5 TFSI GIAC Stage 2 Performance ECU Software UpgradeGIAC performance software helps you extract the maximum potential from your Audi TT RS. Hardware requirements for stage 2 are: Upgraded intercooler Secondary cat delete pipes Power gains have been measured at: 58 wheel horsepower and 51 wheel torque on 91 octane 78 wheel horsepower and 77 wheel torque on 100 octane These numbers were measured on a Mustang MD 500 dyno to all four wheels. Don't be fooled by tuners who only dyno to the front wheels. This