Quote:
Originally Posted by ldweng
I guessed it had to do with the resonant frequency being different from the stock header.
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That's the only other explanation i can think of. I doubted the header was more restrictive, but the only other option was that the resonance was low enough to dissipate in the exhaust system itself. Meaning that the exhaust piping was large enough to displace most of the sound before exiting the muffler. In most cases the decrease in back pressure and increase in flow will cancel out the difference in resonance by way of volume and push more sound though.
so I say again.. does anyone have a before and after dyno result of JUST the header as the altered variable? Flow tests will mean nothing if the stock exhaust manifold is doing a "more than sufficient" job.