Do you have a Rear Lip Spoiler (4-door)?

I really want one of these for my itouring, I think it looks better than the wing spoiler.  Anyone out there with a 4-door who has one of these?  Does it install with dub-sided tape or screws?

read the spoiler or no spoiler post right below this one.. it should answer your question.. i have an S GT... with no spoiler.. was looking at the lip, not the wing~