Cusco's website specifically states that this part isn't to be used with automatic transmission ZD8 BRZ's. I'd like to see Subimods echo that on the product listing to avoid confusion. I was a little annoyed that I wasn't made aware of this until well after I'd purchased the part; after checking the Cusco site for English installation instructions.
That being said, it still installed with little difficulty; the only somewhat troublesome bolt is shown in the last picture below. You'll need to be creative with bit extensions to torque that one down properly.
and the car did seem to turn in with more precision and under-steer quite a bit less during the test drive.