I'm almost done with my helmet then I remembered about the air vents and how they make any helmet look so much cooler. But I can't find any good reference pics, could someone show me where to cut on this picture? Also, what did you use for the vents, Conjugated PVC Pipe?
If you go to Home Depot, look in the plumbing section, they will have big rolls of ribbed piping. I bought what they call 1 inch bilge piping. A reassuring name, I know, but it works really well and looks good. It's like $2 for a foot. You just have to spray paint it black.