If you dump the mesh screens, don't forget to reinsert the rings with which they were fastened. Otherwise you have created a nice little stage which helps to raise the air drag.
I would'nt remove the 1. mesh screen (the 1. one after the bell mouth) , cause it has impact on what the AMM measures ! Your fuel consumption will rise a little bit while not at full throttle. And even though you're probably a fast driver, your not always at full throttle, right ?
I have removed the 2. mesh screens and have shortened the AMM with a saw so that this part of the AMM cylinder( where 2. mesh screen was fitted), has no more impact on the air stream.
Another hint: Center the bell mouth carefully and stick it !