go with oem, i have an "aftermarket" carbon fiber one. pain to install. the oem ones you can remove the end caps so you can see where to drill, and essentially use the vane as the template. the non removable capped vanes you have to place it on the car where it goes, and hope you get the position right for the hardware. then theres the drilling through the three layers of metal. and drilling the holes large enough to get tools on the harware from the inside when the headliner is down.