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Hoffman, in the research I did designing my system your statement is correct BUT ONLY IN THE FIRST FEW FEET OF EXHAUST. Specifially the headers/manifolds. This is from experts in the exhaust field. The only thing about the 3" muffs is that they're loud and arguably, you probably dont need them given the mild cam. But they aint going to hurt ya ( as per Torque Tech, Mr. Gas, and Carl McQuillen Racing Engines.)
 
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