Originally Posted by email@example.com
The only way an ECM can compensate for a difference in air flow is to have a sensor in the trailing edge of said FAE which there is not, therefore the ECM is NOT adjusting for the FAE and only operating only to oem specs.
O2 sensors should adjust to account for changes in flow (again, I have no idea how marine sensors differ from cars). Those OEM spec'd boats would be interested to see if they have any diff mapping in the fuel tables or timing as a result. If not, then I'd feel lots more comfortable adding it to mine.