Wasn't sure if it effected the torque to wheels or such. Thanks for the info.

So what is the difference between the Roush Firm shift and the Non Firm shift?

A bunch of friends and I are going to do the fun run at the local track in our daily drivers. I have a 2007 Mustang GT 4.6 With automatic. The only things that I have added is a Roush CAI (off road) , the Roush Off-Road Extreme exhaust and Roush suspension. I am currently running the Roush CAI Firm ...

Thanks! It worked great! Only bad thing is I had to wait a few days for dry weather.

Living here in California we only have access to 91 octane fuel. I would like to try some of the 93 octane tunes for my car, but was wondering on how to convert the tune for 91. What are the spec differences. I have the U7145 with latest update for use on a 2007 mustang gt with roush off road ...