Simply disconnecting the solenoid accomplishes the same thing for free, doesn't require tools, and can be done and undone in seconds.
The pair system is an air injection system that helps to lower emissions by burning un-burnt fuel in the exhaust. There is an electrical solenoid valve that the ECM opens to let fresh air in when conditions are correct. It draws that air from the airbox and that is the hose you always hear people talking about blocking off. Blocking that hose does the same thing as installing block off plates. Unplugging the solenoid does the same thing as blocking off the hose or installing plates. That solenoid valve is closed when no power is applied. No air is getting by it with it unplugged. It will not cause the check engine light to come on since it's not a monitored output.
Block-off plates are best used when you are looking to de-clutter the system by removing the pair system entirely and never put it back on.
If all you need to do is disable it for tuning, unplug the solenoid. When you are done tuning, plug it back in, easy! The pair will not affect running and causes the bike to pollute more so there's no advantage to leaving is disabled, but all that extra air in the exhaust does mess with the tuner's exhaust sniffer. If you want to install the plates, you can remove the rest of the pair hoses and solenoid for more room under there. The hose going to the airbox will need to be left in place and blocked off or removed and a plug installed in the airbox in it's place. If you don't do one of those, you will be sucking unfiltered air into the engine.
Some say it can lessen some popping from the exhaust by leaving it disabled, but I've never been able to tell a difference myself. I don't know if it's the loud-ass exhaust I have or if it's a placebo effect people get from it, I just can't tell a difference.