A couple interesting header videos

[ame="https://www.youtube.com/watch?v=azPKIjxmmdU"]Exhaust Header Bash! Testing Power Loss From Dents - Engine Masters Ep. 4 - YouTube[/ame]

[ame="https://www.youtube.com/watch?v=O1bXPNy1Yn4"]Header Theory Dyno Test - YouTube[/ame]