Im a little late to the party here, but back on track.
I'm tuned by gearhead, and haven't had any revisions since the initial tune. All I really have for mods so far is catless PPE downpipes, and msd coils. I've been on the list for a gearhead intercooler since February, but that'll definitely be next.
Gearhead has been great for the little interaction I have had so far. I had an issue with knock at first, but adding e85 to my gas has solved that. I personally think my ao tune is setup for slightly higher than 93, since even with 93 around me I still get too much knock without adding about 2 gallons of e85. The shifting though is amazing and the consistent power is great.
I'd say my only con is that they leaned pretty heavy on the bad gas thing for the knock issue. I feel like something else is afoot if no matter what I have to add e85 everytime.
I am super interested in how xsport is going to do a full e85 setup. I don't even want it for pushing max power out of it so much as I want the convenience of filling up with one pump. On that note I had started looking at making a walbro pump work that could flow enough for e85, but that is very cursory research so far.
