Q: Do they come in Carbon Flash Metallic?
A: Yes, please see part number 19409.
Q: Will the Rear Diffuser interfere with the tow hook area?
A: No, they will be installed around the tow hook area.
Q: Is item #11571 an addition to #11424? or are they 2 different systems and will this fit a 2017 Grand Sport with stage 1 rear spoiler?
A: #11571 are the fins that attach to the lower rear diffuser. #11424 is the wickerbill winglets that will attach to the end of the blade spoiler (if your spoiler does not have holes, they will need to be drilled for installation).
Q: what color are the unpainted diffuser fins? they match the black? to match color of the area where they going to be install?
A: The unpainted diffuser fins are matte black ABS plastic. If you are looking to match the rear diffuser you will most likely need the carbon flash metallic fins, depending on your current diffuser finish.
Q: How many are in a set, 1or 2? So when ordering, I want 1per side. Would I order 1 or 2?
A: Each order includes a pair of fins