Actually I have seen headers with 1 5/8th inch pipes as well, so there seems to be three you can actually choose from. I guess I just like to know the "why's" of some things. I guess this stems from the number of times I have heard "information" that stemmed from someone else making a wrong guess at what they thought should be the answer. And it snowballed from there. Take the 160 degree thermostats, for instance. A perfect example of that.
So I guess my question here boils down to why is ANY back pressure good? Isn't this the force the pistons have to exert in order to force the exhaust gases out of the cylinders and into the exhaust system? I would think that this has to be robbing the engine of some energy, since some of the energy created by the igniting fuel in other cylinders is being used for this process. Logic (maybe flawed) would indicate that zero back pressure would be the best solution to reducing that additional work load on the motor.
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