Went to the track last weekend and thought I had the car in great shape. Since hitting the track last fall, where I was pleased with the runs, I've got a new transmission, converter, and removed most of the air conditioning components. The car is running E85 and went 11.29 at 124 last fall. Now I'm getting knock with the same tune, but is the knock real or the result of something else? Please take a look and advise. Here are two back to back runs, with the only change for the second run being adding a bit of fuel pressure to bring the injector duty cycle down. When the "knock" occurs I can feel the car slow down. Looking for advice on where to start investigating.