Questions about the SCT X-Calibrator 2.
 

Good morning everyone. I have a couple of questions concerning one of the ordering options for the X-Calibrator 2. It's a Drop-Down Menu to "Add 2-Step Box Rev Limiter Program" onto the tuner.

What is this, what does it do, does it apply to a 2005 GT 5-Speed, and if so, would you recommend it?

As always, thank you for your answers and input.