I just fitted a set of these, and they flicker, quite a rhythmic flicker, and ever so slight, but it's visible to me, so I took them back out. No errors shown, tried with one LED and both fitted in case of an unbalance or the like. But I've not found a set of HID's ( even those that work in other Boxsters ) that don't flicker in my car either. Perhaps it's my eyes that flicker If anyone wants to try them, cross my palm with £10 and I'll stick them in the post. drago.d - any flicker on yours? These are much cheaper that others posted on ebay ...Hi, nope no flicker at all. Perfectly fine.