A lot of carbon fiber parts on the internet are just junk. Their pictures look nice, but they have very low quality if you see them in person. For example, Password JDM is the company that advertises their fake "dry" carbon fiber parts. The galleries in their website are fantastic, but their carbon fiber products look so cheap in person.
I had a seibon type r spoiler on my previous nsx. Serious, it was just a garbage. The surface, fit, and finish is terrible and it feels damn cheap. I felt I wanted to throw my spoiler away after I saw a downforce spoiler on another owner's car in a local meet,
seibon, nrg type r spoiler= $450
downforce spoiler= $1500
procar spoiler= $2000-$3000