Do you run headers ?

[Groucho]

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I disagree that headers don't move more air. They do. Sure, eventually the same amount of air can be moved through a Mcdonalds straw, but headers will move more air that those LS5 exhaust manifolds will, given a specific window of time- say a 1/4 mile pass.

I disagree that the sound out of the back of the car will be quieter with headers. I get you theory that sound is dissapating through the headers so there won't be as much sound to make it out of the exhaust tip. I just disagree. There are several other facotrs at work here. I would think they the rougher surface of the cast iron manifold would deaden the sound more that what audibly leakes thhrough a header, but that is just one unaddressed point.

Don't get me wrong, I am fine agreeing to disagree but you asked for some specific points.

[/ QUOTE ]We all have our opinions. When I was 14 (1969) the guy across the street had a 68 SS 350 Camaro w/4-speed. He put glasspacks on it right after he bought it new. By 69, they were LOUD, and I could hear him 3 blocks away when he was coming home from work. I'd go out there almost every night and hang out with him. One evening, I could barely hear the Camaro, but I heard something. I looked out the window, and it was him. I ran over, and said, hey, why'd you get new mufflers? He told me the only change that day was the installation of headers. MUCH quieter. Probably the most drastic that I've heard, but certainly not the last. Anyway, I came to learn WHY it was quieter. It's fairly difficult to argue with facts

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I would say that the car seemed quieter and probably was at that particular cruising RPM.
The headers are changing the way the air is coming out. Its probably coming out a little smoother and faster. Meaning at certain RPM's maybe it is quieter than before. But maybe at higher RPM's it will actually be louder than before.

[/ QUOTE ]The car was quieter. MUCH quieter, at all RPM's and conditions. And I've already outlined why. But, go ahead and weave it til you're happy. No worries. I'll try to keep logic and fact out of my posts in the future. LOL