These look interesting but are a bit pricey. For the price I'd rather have the full carbon 19" wheels from the GT350R or the 20" from the GT500 Carbon Fiber Track Package. I also wonder if they are as stiff as the full carbon wheels?
https://www.motorauthority.com/news/1124444_forgeline-releases-carbon-fiber-and-aluminum-wheels
https://www.motorauthority.com/news/1124444_forgeline-releases-carbon-fiber-and-aluminum-wheels