3. We turned the ignition key to the run position and followed the on-screen instructions. We chose to add the 87 octane tune, instead of the 93 octane tune, because in California, we only have access to 91, and we would rather be down in power by a bit rather that having the motor ping. We also firmed up the shift points and recalibrated the speedometer for our larger-than-stock tires. When we were finished answering the questions, the programming began.