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05-19-2014, 06:36 AM | #111 |
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05-19-2014, 06:19 PM | #112 |
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05-20-2014, 06:30 AM | #113 |
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Stepped headers change pipe diameter incrementally on the individual runners to increase exhaust velocity and flow. It's significantly more labor intensive, but the gains can be quite dramatic.
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05-20-2014, 07:06 AM | #114 |
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