FYI - The header from any year will fit. Gen II headers just have more catalytic convertor junk. I'm running a Gen I header on my 2008 FJR without any problems. It mounted up without any tweaks.
I have one that came off a 2007 AE. It has a dent in the one side collector where it goes 2-1. I replaced it with a used one. Just hanging in my garage depending on what you are going to use it for.