Bad Dawg, I think the point here, as I am sure you know, is headers alone will not make comparable HP increases. However, if you have a heavily modified vehicle and test it, then add headers, where you previously had none, you will surely see significant gains. The engine can now expell the gases more effeciently.
Take, for example, a Nextel Cup car and put standard exhaust manifolds on it and run the car. Then add the headers. Huge difference I would suspect. Probably a huge percentage gain.
Black Lingenfelter Lux
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