mine is in the mail back to me from Brian and this is what was on my receipt as well. So it must be a thing. I might follow up with Brian just in case. Overall, he has been super helpful in answering my questions and the turn around time was a week so kudos to Karcepts. Excited to get it installed.

 

Like I posted before, yes it is a thing but only on some tunes (like for CA people). It is not a default as in lots of areas it is fairly easy to get 93 octane.

You can also drive the car fine on 91 with the 93 tune. It may pull timing if you get on it hard and will not maximize the performance from the tune. This was also per what Brian told me when I purchased mine.