| the claim? I'm thinking that when producing some 700+ flywheel horsepower, 350 horsepower per side, puting all that air through a single 2.5" pipe (which actually has an i.d. of only 2.33" ) has got to be a point of restriction. The smaller diameter pipe will create higher exhaust gas velocities and in turn, create more drag on the flow of the gases, making the engine work harder to push the exhaust out. The larger 3" pipe (with a 2.87" i.d.) will decrease gas velocity and the resistance will go down by the difference of the squares, which will be an appreciable amount considering the difference in area from 2.5 to 3.0' is 66% (the area of the pipe ties proportionately into the velocity of air through it).
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