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#1 choice would be the wald spoiler (molded of course)
#2 OEM i think
Agreed with metaleckz, #1 choice is Wald for most IS owners. After that it's either the OEM spoiler like I have or the f sport spoiler. They all look nice though, but I plan on getting a Wald molded on in the near future. Just making my car look better as a whole before I put something that aggressive on it
I ordered the OEM replica off of eBay for my car and it came painted and ready to install along with some 3M tape. Install was fairly easy but I do recommend you have a buddy help you out to make sure you got the spoiler lined up and applied properly. Very easy and very good quality IMO. I'm sure no one would know it's not original unless I told them so.