insurance
when i put one on my cupra i enquired to what the cost would be if declared (told them i was thinking about putting one on and wanted to know difference in price) they quoted £50 increase which i queried, they then asked me what it was!!!! to which i replied it joins the front suspension together, is not visible, and does not make the car any quicker. after this response they agreed that no extra charge was required, so might be worth explaining what it actually is!
hope this helps, if not sorry for wasting time!