As we know the APR tune (as well as others) makes quite a difference on the performance of our cars. Beyond all that, I have heard that the APR tune allows brake boosting, deletes the speed limiter, and deletes the secondary O2 sensors.

Why I started this is to find out what other owners know or have found in their APR tune. I don't think that the tune allows brake boosting after trying. I only tried once however. This makes me wonder about the O2 sensors. "Chip" in if you know anything about the above, or any other features not mentioned.