Beat up, Dented, and "clearanced" Headers.....

I saw that a while back and was impressed as well. If you look up the Micron Serpent motorcycle headers (don't know how to post pics from my phone), you'll see that the right kind of dents can MAKE power. Those headers made great power gains on the Buell XB engines.
Too bad we don't get pick where we have to put the dents.

If I could make the dents look decent, I wouldn't care.