You can clean it up but I don't think the stock exhaust is stainless so you will only get it marginally good.
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It does look like someone's either cut off the grill that covers it, or folded it up out of the way.
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There are quite a few options for shiny stainless aftermarket exhausts for the N/A.
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If you don't like the idea of having an exhaust that's bigger than your engine then you can get a blueflame or mongoose exhaust
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- these still have the large central silencer with twin exits.
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Or if you like having massive cans you can get a japspeed exhaust but they are LOUD.
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I don't remember off the top of my head whether there is a motoria exhaust for the N/A as well.
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