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Exhaust puzzler
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07-24-2007, 06:29 PM
Nascar Fan
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Join Date: Mar 2007
Location: Pine Bluff, Ar.
Posts: 28
If it was drilled, likely to test the pressure on each side of the cat. A hole in front and one in the back of the cat can tell the pressure difference and therefor tell if the cat is pluged.
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