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exhaust zommies
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05-12-2010, 02:08 AM
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shawnp
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RACING JUNKIE
Join Date: Mar 2003
Location: Ohio
Posts: 936
I know in talking with Tim at The Fab Shop that they did a dyno session where they ran upswept, downswept and zoomies on the same motor. What they found was the zoomie on average was 40hp down from a standard header.
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