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Old 03-19-2008, 02:23 PM   #71
Homemade WRX
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Originally Posted by rxw View Post
Actually not to be anal but a 3' dump plus a separate 2' dump only equals a 3.6' total dump area because it works on surface area...

3’ dump = 1.5 (radius) squared times pi
2’ dump = 1 (radius) squared times pi

3’ area + 2’ area = 10.210 square inches

Divide that by pi then square root it you should get 1.80277564 (radius)

Now double that and you have you total diameter for your exhaust dump-age AREA

flow is going to be a bit different and your method would have less flow loss
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