Nice looking piece for sure
I don't think you can polish somethingt like that...It's probaly been chromed by someone. Polishing isn't all that bad though but you pretty much need something Aluminum like the compressure housing on your Turbo. You start off with some pretty rough grid paper/wheels and work your way up to some pretty high grit paper/wheels like 400 - 1000 grit. The only thing, it can be time consuming and require some elbow grease. I polished an upper Intake on my SVO and didn't even get it mirrored finished and I had a few days tied into it. I even used a diegrinder to get the really tough areas and a dremal on other parts. Anyhow, It was fun but I went with powder coating for the lower intake lol .