I see what you mean now
I dont see it being beneficial just a waste of money. to get the best connection you want metal on metal contact, which will require removing the paint - which can lead to rust in those areas. yes it would work when you put it over the paint but still...
subaru did a good job designing the car and it works well
get a lightweight crank pulley and the engine would rev a bit faster. if you have a MT get a lightweight flywheel instead