That's the smog pump. They added that I believe in 2011 or 2012. That's why I said They used an older model that isn't compatible with your 2.5 gen. I think there is a bracket to relocate the pump and a wire harness to extend the wires.
Thanks. I haven't decided yet. It's all aluminum except for the hardware. I know the bolts will start to rust at some point so I will probably paint it once I have some decent weather.