
12-08-2010, 10:17 AM
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CC Member
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Join Date: Oct 2008
Location: Lions Bay,
BC
Cobra Make, Engine: CAN-AM cobra, 460 SVO
Posts: 326
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more food for thought: if you have 4 header pipes at 1.75 inches internal diameter each, thats a total cross section area area of 9.6 square inches. A 2 1/2 inch ID muffler = 4.9 sq in, (no wonder there is a flow restriction) whereas a 3 inch ID muffler = 7.1 sq in, a 44% increase in cross section area, but still much less than the 4 header pipes. Although there is probably a bunch of fluid dynamics math thats way over my head to add to this... 
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