Ceramic coatings have excellent resistance to heat transfer -- and they're entirely different from powder coating. Powder coating won't significantly affect the intake's ability to pick up heat from the engine bay. Ceramic coating will.
For some reason the system won't let me make a new post replying to your question. So I'm gonna try editting this one....
If you were more specific in what you're trying to accomplish, it would be easier to interpret what this "will be good or bad for it?" means.
If achieving a cosmetic look similar to the Viper is your main goal, mimicking that with powder coating should work fine. I'd just ask to see a sample from the powder coater so you're absolutely sure of what you're gonna end up with. If your primary goal is trying to insulate the manifold from underhood heat to keep the intake charge cooler - ceramic coating is what you want, not powder coating.
With either coating, the piece has to be media blasted to bare metal. Powder coating is basically coating the piece in a colored plastic. The manifold is blasted, cleaned and then negatively charged. The plastic powder particles are positively charged. So when they're sprayed out of the gun, the electrostatic charge holds attracts the powder to all parts of the piece coating it evenly. The piece is then baked to around 300-350F to 'melt' the plastic - both smoothing it and letting it completely bond with the metal. It's a very tough finish that stands up well under the hood. But it's only good for about 300F (can't use it on exhaust headers for example), and it doesn't provide thermal insulation.
The process of preparation/application is similar for ceramic coatings. Piece is blasted/cleaned (usually heated to 400F to thermally clean and remove oils), then the coating is sprayed on just like paint (no electrostatics involved). Headers are often coated inside and out. The piece is then baked at temps up to 700F degrees to cure the coating. Different chemical composition coatings are available for different temperature ranges - 800F for engine parts, suspension pieces, brake calipers; 12--1400F for most exhaust components; 2000F for extreme temps (piston tops, combustion chambers, boosted exhaust components, etc. There's not NEARLY the color choice for ceramic coatings that there is for powder coating. These coatings are EXTREMELY durable resisting physical abrasion, chemicals, and temperature. They will help keep your intake from absorbing or radiating as much heat as it would with a plastic coating.
Having said all that - I have no idea what type of finish the wrinkle finish on the Viper's intake is - paint, ceramic coating or powder coating. Without knowing that, it's impossible to know if that type finish will accomplish what you're trying to accomplish.
Did that help clear up your confusion?
Something's wrong with this thread - it won't let me post a new response - it gives me the 30 second too-soon-post warning each time. See this pic - this type of silver finish is the most common; but they do come in different colors.
http://www.corral.net/photopost/data/500/30684headersnewandold-med.JPG