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Old 07-06-2010, 07:20 PM
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Default True dull x pipe inner diam size?

Ive checked there are different inner sizes. At this point its 2 exhaust headers 2 1/2" diam going in to a 3" y so should the inner diam of the x pipe be 3 1/2, 3 3/4, 4, 4 1/4, 4 1/2 and so on?
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