Well I don’t want to beat a dead horse but after reading all the feedback on this thread I just had to chime in on my facts about the 91 octane, k&n air filter and tunes on my car. I work for Dodge and had one of the veteran mechanics take a look at my 16 GTH. Now, even though the calibration/tune does not reflect on my newly received hertz package Shelby invoice my car does have the 91 octane sticker, K&n sticker and filter and is tuned per the mechanics assessment of the car. Air/fuel ratios are in the 13.9-14.2 range indicating a tuned vehicle. My opinion is that one or two (could be more) Shelby techs tuned a few GTH cars without anyone’s knowledge and got away with it.