Probably a smart move. The intake air flow isn't a huge factor until you change the exhaust (which you did). If you go with a lower restriction intake filter that may require a remap since the adaptation only goes so far (usually). I haven't been into the 2.5's long enough to get a handle on the absolute range the adaptation will take the FI system.
That said the gauze type filter don't require a lot of maintenance and usually improve Throttle Body laminar air flow the more they load up. They ONLY way that I'm aware of to determining filter efficiency is using a dP guage. That measures atmospheric pressure on one side of the filter to air pressure on the other side (similar to how your EFI operates with a MAP sensor (after filter) and airbox barometeric pressure sensor (before filter)). The lower the reading the greater the air flow. As the filter loads up and restricts air flow the downstream pressure drops so the differential pressure increases. Above a certain point, the filter needs cleaning. To my knowledge nobody makes a dP guage for motorcycles. So it's best guess and how long between service intervals you feel comfy cozy, or wait till you throw a DTC saying the filter need changed.
