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Old 10-27-2010, 08:46 PM   #4
usa1camaro1969
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Drives: '10 LS + a few more
Join Date: May 2010
Location: Texas
Posts: 1,641
The exhaust from the manifolds is 2 1/2" through the h-pipe. There it necks down to 2 1/4" the rest of the way back.
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