To answer your original question, a single wall header will reach up to 1100 degrees right off the engine. No idea on the double wall, just a guess would be 350-500 while moving near the engine.
Raymond
Thanks. That's pretty much what I was looking for. Just a "ball-park" figure. I understand there are different variable's that will cause more or less heat at the header's.
I was able to get a lazer thermometer on loan from work. Just for grin's, I'm gonna check my stock pipe's. Then in a couple weeks, I'll check em with my TBR's on.