Not Ranked
here's something i posted on anothe thread, might be helpful. guess if you want velocity put it through a straw.
from open exhaust to 3" inlet dual race muffler that flows 2000cfm total
512tq/510hp to 506tq/506hp
from open exhaust to 2" inlet dual race muffler that flows 900 cfm total
512tq/510hp to 463tq/462hp
from open exhaust to 1.5" inlet dual race muffler that flows 500 cfm total
512tq/510hp to 436tq/422hp
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