moisture and brittle headers, BAH!

I've been using it for nearly five years now. I recently (on the third year) pulled my downey 4:1 header to install a thorley tri-y. the downey was wrapped for 3 years. I originally installed header wrap because of the heat issue and to reduce the noise associated with headers. out of curiosity, I pulled the header wrap to see if the metal was fatigued or "melted" (some guys claim you can heat your header to the point of melting it if you wrap it - total bs.) and aside from minor surface discoloration and a little rust, there was no noticeable damage to the header. there was one spot down near the collector where all four tubes come together that had some rust flakes, but other than that, tip top shape.

I have my thorley wrapped, and will continue to wrap any future headers I install. I much prefer the reduced engine bay temps along with the reduction in the header tick noise. I'd rather cook a header (if that can even happen with a daily driver) than heat damage other components in my engine bay, which is more likely with the increased temp a header puts out.

but that's just the humble opinion of person who's actually used the stuff.