taking out the air intake restrictors. 

those guards are to prevent water (rain) from being sucked into the airbox

The CB650R A2 is restricted the following way: A new set of air funnels that restricts airflow by 86%, and a rewrite of the ECU to match the new air/fuel mixture. With this setup peak power (35kw) is at 10.500 rpm. The air funnels can easily be changed, and the ECU can be reset to full power. This is how Honda delivers it to the EU at least.

No u need a ecu remap, and the snorkels in the air box need to be changed and it needs an after market exhaust

👍🏻👍🏻

that is not a restriction....

They are part of the restriction