Quoted:
Quoted: I doubt it offers any significant performance increase. Why? Because the energy contained in the exhaust gas is used to do mechanical work on the spinning barrels and NOT any increase in exhaust velocity.
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yeah but they rotate......
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How does that help? Headers work at a certain RPM due to the relationship of their diameter to length. For any given diameter, the RPM where header effectiveness is at its peak can be raised by shortening the header.
Longer, thinner pipes are better for lower RPM where large, short ones for high RPM. The same thing holds for the intake. It is called resonance tuning and Hemholtz wrote the equations a long time ago...they still apply.
Any one can massage dyno mumbers...no two days are identical so unless the conditions are identical, all bets are off.