Yea, we had to keep it pretty conservative because knock was a big issue. I think colder plugs may have helped a bit, but overall higher octane would have been better. He was a little surprised at how quickly it was pulling timing since in MN, basically all fuel has ethanol. Sadly, this is whats available here, so I wanted it tuned for it. The tune feels awesome! It is far better than the Cobb OTS VF34 tune, which honestly made me want to go back to the TD04. Now it pulls like the TD04 did, but pulls basically all the way to redline.