I did a stupid thing and bought a TRD intake off a 5th gen. Somehow I got it in my head that it would fit even though I can't find any sources that say that it will. In fact, there is at least one thread on this site that says it won't fit. But I hadn't read that before I made the purchase.

The lower airbox bolts right in. The grommet into the upper fender also fits perfectly. Everything lines up, but unfortunately it's way too tall so the hood won't close. You can see how tall it is in the photos.

Now, I'm still an idiot and I really like this intake so I'm going to try to make it work. Since I couldn't close the hood, I'm still running the stock intake, but maybe I'll cut a hole in the hood or something. Resale value be damned.