When watching the Saleen Automotive Tesla’s Model S EV based FourSixteen video they made a big deal of removing 18lbs per corner by replacing the rotors with carbon fiber rotors. They also state that since this is "rotational" weight it is even more effective just saving 70lbs elsewhere. While I believe Saleen changed the calipers as well, the rotors seem like a very easy DIY modification. Has anyone else changed rotors to carbon fiber? Is there a part number out there that works? Possible group buy?