Have you run the fat cats in a 2stoke turbo? I was told they were built for the 4stroke and have a different profile. Steve has faith they will work, just wondering who has run them. They are 97 grams empty, so it will take a lot of boost on an m8 to need that much weight. I also sure if the secondary needed for spacers, shift assist, black washers? I run the older open helix with the adjustable spring cup. Now I only have the 1 large black washer in the secondary and no shift assist.