You can remove the flaps and have your car tuned to run without them. I had that done in my 06 Mustang GT (see CMDP plates, charge motion delete plates)
The 2.0 has the tumble flaps and there was a change between 06 to 07 in the factory tune of them that actually bumped up the mpg in 07.
2014 Focus SE Manual -
2006 Focus ZX4 SE Auto -commuter 110k /traded