Quote:
Originally Posted by RET_COP
Ron It doesn't make sense. Louvers facing toward the engine "shear" off exhaust and direct it into the outer chamber vs. the reverse direction and a smooth movement of gasses over the louver. Just the word Shear makes me cringe. I'll take the smooth way over the "shear" way any day. It's like putting a vane on the intake valve guide in the runner. It goes in the direction of smooth flow. I can't imagine it any other way
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Lou, it does not make a big difference turning the louvers one way vs. the other in flow. Going OVER the louvers (with the grain) is about 4 dBA's louder. I recommend going against the grain & INTO the louvers. None of the Cobra guys have used the 3.5" OD chambered Powersticks with the crimps in the outer body! They look different (they look very "industrial") & they sound MEAN! Much more mean than with the smooth 4" body. The crimps in the outer body create sound wave anomalies that really TUNE the exhaust note.