Ok... Now that we know what paint we want...
Read the rattle can thread. Metallic paints can be a real pain in the ass if you're not careful. Make sure its a dry warm day or you're in a dry and warm place. Make sure the paint itself is warm (I use a bucket of hot water to hold the cans in until theyre warm) and its very very very important that the part is warm as well. Not hot or anything, but at room temp.
Also VERY IMPORTANT is making sure the part it COMPLETELY clean. Not looks clean or seems clean, but actually clean. You can use high grade cleaners/degreasers (I like "ID RED" by Zep) and get ALL of the grease, oil, grime, and so on off and out of the metal (some folks heat the part to bleed the oils and contaminates out of the porous material).
Than follow the manufacturers recommendation for a primer/sealer and painting.
Take your time and do some test pieces to get the technique down. Metallic paint is very easy to screw up and difficult to fix easily.
That said, when done right... It looks awesome.