So what are the gains? The baseline on a MKVII GTI is 210 horsepower at the wheels. On 91 octane with the APR tune this rises to 281 horsepower on the wheels. 93 octane boosts power further with the APR tune taking the car to 291 wheel horsepower. The race gas figure is 303 wheel horsepower.
APR did not take the tuned car to the drag strip but did some VBOX performance meter testing. Their 93 octane VBOX trap speed is 97.19 miles per hour. The trap rises to 110 miles per hour with the Stage I tune on 93 octane. This figure will be lower on an actual drag strip as the VBOX tends to read higher.
Dynographs and an acceleration video below. Solid work as always from APR.
Stock vs. tuned acceleration numbers and overlay video: