12-16-2004, 02:02 PM
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Good morning!
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Join Date: Dec 2003
Location: Napa California
Posts: 4,445
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I driled them where back pressure would back up, and in a way to shorten the flow of the exhaust gas. It improved performance some, but I'm trying to fet my hands on some other mufflers to cut up differently and see what works best.
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