Originally Posted by DHPRO
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.
How could O2 sensors adjust for added exhaust tubes, changes in flow etc. when they aren't even there (after the FAE). BTW the "sensors" on engines don't compensate for air flow or the like, the characteristic (or flow) of an engine is preprogrammed in the ECM, the only thing an O2 sensor does is measure the amount of Oxygen in the exhaust gases and reports to the ECM then the ECM makes adjustments to the air/ fuel mixture, flow has nothing to do with it.