I'm intermediate at best when it comes to performance modifications and such so probably am backwards. The reason I thought that is from watching an episode of "Two Guys Garage" where they installed headers on a new Camaro and he went into great detail about exhaust "pulses" and header length. It seemed pretty convincing. Watch this starting at 7:07 and tell me what you think.
[ame="http://www.youtube.com/watch?v=n8VlynaUVO8"]YouTube- ‪Two Guys Garage: Exhaust on Custom Camaro‬‎[/ame]