I bought aftermarket full carbon fiber fenders and was disappointed with the fit. I ended up selling them before completing the installation. Fitment just wasn't right. The person who purchased them was able to get them installed and was happy, so they are an option, but not if you want oem look.
I had a local shop
hand cut vents in my stock fenders and very happy with the results. I believe Carbon Signal oem vented fenders are much the same as my custom fenders.