Well if you believe the episode of Enginemasters from last month, you can basically go to town on your headers with no power loss.
I was gonna ask about your setup, but since you've already bought (and dented?) these headers, I'm not gonna tell you you could prolly find some that fit stock.
Do you have a welder/a way to fix any damage from over-exhuberance when denting your swanky new product?
Also, final question- did you get coated headers, or uncoated?
