Sorry folks, I can be repetative.
It occured to me today, that I read a post done by the frenchtown flyer (believe he is an automotive engineer) some time ago on another forum, regarding crossover pipes.
My experience means nothing because of my no name hobby shop status... :rolleyes: ...so maybe the thoughts of an engineer will shed light.
And I quote:
A crossover pipe IS USEFUL on a six cylinder engine and even a four cylinder engine with dual exhausts. Some motorcycles use them, even two lungers. What they do is to attenuate the peak pressure rise in the exhaust system, thereby lowering the maximum overall backpressure that is seen at the exhaust valve. "X" pipe designs maintail a little more velocity than an "H" pipe but they're all good. If anyone would like to read thoughts, done by those that HAVE installed a crossover pipe on their inline engine and the effects it had on the sound, I can offer you a couple links. One contains a post by another tech, very informative.
Thank you for your time.
