Which one would be best to use when making a custom intake to have maximum air flow. Metal (galvanized steel or something similar) or a plastic material (PVC)? Just curious.

 

Are you wondering about it's smoothness on a molecular level for that extra .1 cfm or so??

Well if there's no problems or limitations with working with either material, I'd go with plastic just because it stays cooler. Other than that I'd pick whichever one is easier to work with. PVC piping is probably smoother than the inside of furnace ducting-like galvanized pipe, if that's what you're comparing.

 

Good point. I forgot about that.

 

Don't use PVC pipe under the hood, too much heat causes it to release some funky gases that may be harmful to you or your engine.

 

Hmm, good point number 2! I think I've heard of this before. I guess you'll have to use some heat-resistant plastic like they use already. Maybe consult a local plastics shop on what specific kind(s).

 

I'd go with metal coated with Teflon! Spray some PAM cooking spray in your intake and you've got a nice, smooth, slick, non-stick intake! And I think PAM is flammable!

 

ya i was gonna use plastic but that's why i decided against it.