So just wanted to put this out there for anyone searching this info.
I got an Intune tuner from Diablo for my 2005 GT. I at first ran the canned 87 octane tune because that's what was in my tank. Noticeable difference over stock was much livelier throttle in the lower to midrange rpms and a noticeable change for the better in HP overall.
I ran the 87 octane out and filled it with 91 octane and installed the 91 octane tune.
I noticed that the lower and midrange throttle response seemed to go back to what the stock tune had but the upper rpms had more power and pull than the stock or 87 octane tune. Switched the tune back to the 87 octane tune and the lower and midrange snap returned. I don't wring the car out and enjoy it more in the lower to midrange rpms so the 87 tune is better for me.
I got an Intune tuner from Diablo for my 2005 GT. I at first ran the canned 87 octane tune because that's what was in my tank. Noticeable difference over stock was much livelier throttle in the lower to midrange rpms and a noticeable change for the better in HP overall.
I ran the 87 octane out and filled it with 91 octane and installed the 91 octane tune.
I noticed that the lower and midrange throttle response seemed to go back to what the stock tune had but the upper rpms had more power and pull than the stock or 87 octane tune. Switched the tune back to the 87 octane tune and the lower and midrange snap returned. I don't wring the car out and enjoy it more in the lower to midrange rpms so the 87 tune is better for me.