are limited to 91 octane. So your tune for 93/94 octane is meaningless to us 91 octane folks. With race gas we have a level playing field and know the full potential of the turbos. Also what may seem safe on 91 93/94 octane on the dyno may not be safe for the street. The dyno does not load the car like the street does. On the street there is no cool off time like you do on the dyno.