How to- Polish intake manifold to a mirror shine.
first off you will need to go to your local hardware store or your store of choice and buy 180grit,400grit,600grit,1000grit,1200grit sand paper,buffing wheel to use with drill,palm sander,metal polishing compound,drill and wire brush.
Step1: use the wire brush to get off all the dirt and oils off the manifold.
Step2: use the palm sander if you have one(if you dont have one you can use your hand but it will take longer) start out with the 180grit sand paper, start sanding the entire manifold. you should get it pretty smooth with the 180grit. then work your way to the 400grit and when you get to the 600grit start using water while you sand.until you get to the 1200grit.
Step3: take the drill with the buffing wheel and use what ever polishing compound you choose. apply a little polish compound and buff it in with the wheel. make sure you are careful on the edges and not nick the metal with the drill or the end of the buffer wheel. Start out on one end and work your way around the entire manifold. the more you buff the more it will shine so this is up to you on how long you want to do this step for.
When your done it should look something like this hope you enjoy

This also works with valve covers and throttle bodys!