Going on what Russell posted earlier, it seems to me that you simply run the shims that come with your motor. If that's what the factory supplied, then that's what the batch, model etc of the motor you have requires. The break in shims come seperately in a sealed plastic bag with a protective cardboard sleeve to be used if required. All other shims are factory pre installed under the head button. From what I am told the turbo button is no different than the standard button as far as shims go. Just change the buttons over, put the original shims back in and go hard. Maybe I am missing somthing here (if so, please excuse my ignorance ), but I can't see a problem.