i have heard that slight dents on the header can majorily affect the exhaust flow... im wondering if the scrapes from hitting the ground on my header are only affecting the appearence or if they look like they are bad enough to affect performance.... thanks for the help

 

That looks pretty bad! Do you take your car off road or something?

I can't imagine those causing any noticeable loss of power, depending on your modifcations. They look more scratched than dented IMO.

 

those shouldnt do too much.
ive seen worse

 

You shouldnt worry to much. Looks more like cosmetically it is fucked up. If you were boosting high boost levels, then maybe air flow and turbulance would factor in.