Quote:
Originally Posted by MantisSport
Todd;
With all due respect, I think that you and Mr. Dinan are in agreement.
He stated that the functionally important part was the design of the manifold and header system, beyond that, the less backpressure the better. You are both saying that the correct design for the header is paramount to increased output.
Stan
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Nope.
According to that quote, he is saying that the bigger the better on a catback: "After the header, less backpressure is always better."
I am saying that in a lot of cases, the entire header and catback system is designed to work together to optimize cylinder scavenging abilities.
The flow through the header is affected by what is going on downstream. Go larger or smaller downstream and the flow dynamics in the header will change, too, sometimes for the worse, producing less power.
Therefore, you *can* go too big on the catback portion and disrupt the exhaust system's overall scavenging effects, as the header was designed with a certain cat back flow in mind.
If he had stated that "Throughout the entire header and catback systems, less backpressure is always better", I would have agreed with him.
However, you can't just max out the size of the catback portion after the header in pursuit of less backpressure there and get an automatic reward of more power. Which is what he is suggesting.