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      11-09-2011, 07:51 AM   #7
cssnms
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Drives: 2011 BMW 335d
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area = pi*r^2
area of two 2.5" pipes = 2*(pi*1.25^2)
=9.82"^2
area of two 2.25" pipes = 2*(pi*1.125^2)
=7.95"^2
area of one 3" pipe = pi*1.5^2
= 7.07"^2

I was a little off. It's more than 3" and less than 6".