I did some research on the 2011 airbox today. It will not be a direct bolt in as the lower opening
between the 09 and the 11 are not the same. Some cutting on the inner fender will be required.
These measurements are aprox but close
Filter size 2011 100 sq inches
2009 83.3 sq inches
This is not the surface area of the of the filter element only of the outside dimensions.
The opening in the bottom of the 2011 is not a round hole and I don’t
think it will totally line up with the 2009 hole.It is sealed to the inner fender
with no opening to the engine compartment.
The 2011 hole is aprox 15 sq inches
The 2009 is 15.9 sq inches.
The 2011 cover is taller then the 2009.
Currently K&N doesn’t offer an element for the 2011
I won’t be dynoing this setup but it should be good for something.
I’ll post later after the install.