2010 50hp 4-stroke to a 60hp

[Shipofools]

I recently had a person tell me I could remove an air restrictor from my 50 yamaha and effectively have a 60hp motor. Can anyone tell me if this is correct? I currently am getting 5400 rpms with the current prop so I have some room to spare in that regard. The person telling me this says he has been running this way on his 08' for two years.

[boats.net]

Shouldn't run without the air silencer, could result in a lean running condition.

[cvslawrence]

I have the same engine, and have read of others doing this conversion.

I do have some reservations, removing the restrictor is easy enough, my fear is that the ecm is not capable of adjusting to the increase in airflow, therefore creating a lean condition.

Being a veteran auto mechanic, i would not hesitate to do a similar conversion on an car, as the fuel management system is capable of correcting the fuel trim for the increase in airflow.

I see a throttle position sensor, crank position sensor, and what looks to be a manifold absolute pressure sensor. What i do not see is an oxygen sensor.
I would think the map sensor would see the change in airflow and the ecm would correct the fuel curve.

Anyone out there to confirm this?

Thanks!