
02-26-2004, 09:04 AM
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Banned
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Join Date: Oct 2003
Location: Yorba Linda,
CA
Cobra Make, Engine: SPF w/392CI stroker
Posts: 3,293
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Not Ranked
What's inside my SPF sidepipes?
Fiberglass packing? Steel wool? Perforated steel inserts or cones?
I just want to understand what makes them so quiet when compared to others I've heard. 
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