Factory YZF450 headers?

[WKY400EX]

I'm not very educated on metals, so maybe I'm asking a dumb questions. What material does Yamaha use for their factory YZF450 headers and where can I buy some of the piping?:confused:
Thanks.

[WKY400EX]

Are they made of stainless steel or what?:confused:

[panteramatt]

I think there titanium.

[YZ400EX]

I think stock they are stainless..I just got one and it looks just like my HMF pipe which is stainless..I could be wrong though..I am looking to but some tubing of the same thing as well so if you find somewhere to buy some let me know..