There's no such thing as a REVO "chip". Their product is ECU code that gets flashedf onto your existing ECU (into unused code blocks). You can purchase a "dongle" that allows you to switch between the REVO code and stock ECU code. Some dongles also allow you to change parameters of the REVO code.
I hope this helps to explain how it works. BTW: Many folks think that REVO is undetectable because the ECU is never physically touched. However, if VW wised-up, they'd look into code blocks that should be empty and see REVO code and then know that you've modified the ECU.
A forum community dedicated to all Volkswagen owners and enthusiasts. Come join the discussion about performance, builds, modifications, classifieds, troubleshooting, maintenance, new releases, and more!