: Exhaust flow numbers



sti convert
06-04-05, 12:54 PM
Looking at the Corsa site they list the stock exhaust flow as 479.6 CFM. This must be through just one muffler as it seems about half of what it should be for total flow. Can anyone verify this? Using the rule-of-thumb of 2.2 CFM/hp would be a total required flow of 880 CFM or 440 CFM per side. That puts the stock exhaust just right in stock trim.