I know this isn't an answer but it's some conversation regarding same question (I also own one). My dealer loaned me a used helix to try which was a takeoff from another dealer's setup so the numbers have been scratched off, we do however know that the finish angle is 40 degrees so I'm going to give it a try but unfortunately have not installed it yet. I really think a simple helix change will make a big difference. The factory helix ... 64-36.25 is so damned lazy on shift out that you never really make the engine work. I think a 40 degree finish angle helix will do wonders for this high torque engine.