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The area of a circle is diameter x diameter, divide that by 4 and multiply by 3.142.
Therefore the area of a 3" diameter pipe is 7.069 square inches.
That I am afraid equates to a much bigger rectangular section of 1" x 7" or 2" x 3.5".
However an oval section of 2" x 3.96" also equates to 7.07 sq in and is possibly the most practical alternative.......but very difficult to bend round a chassis.
What would really be beneficial, is for example with a 500hp big block, running 2" primaries, what is hp loss between 2.5 and a 3" collector pipes, if any?
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