SBC header tube diameter
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04-01-2013, 10:28 PM
Join Date: Jun 2012
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I use 3 inch mandrel bent exhaust with an X pipe,2 1/4 is a joke.
My primaries start at 1 7/8 and step to 2 inch with 3 inch long collectors,my engine is N.A.
You should make more power than me so you need bigger
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