exhaust manifold

hi...I am a newbie here and I have a simple question.

In the modelling instruction(guide book) for my Porsche Carrera GT, regarding the exhaust manifold, there isn't any Tamiya Paint number written, does that mean I don't have to paint it??

Thanks a lot to you if you can answer my question

In the section that shows the manifold, is there a shading color on another part which matches the shading of the manifold?

NO...:(
the whole section for the exhaust manifold has no color written in it.
So....??

I don't have this kit so I had to look it up online, but once I did it was pretty obvious why it doesn't tell you to paint the part - it's chrome plated and doesn't need painting!