I am almost 100% the carbon diffuser on that site is just an overlay ontop of Fiberglass or FRP.. Carbon fiber is either hit or miss. Its alot harder to work with genuine carbon parts compared to regular FRP / Urethane etc...

I wont buy unless i was 100% sure it would fit properly. Otherwise you would find yourself spending alot more than you would want to spend just to make it fit somewhat decently.