Dont pods do the opposite of restrict? They let in more air than an airbox that's why more fuel is needed in the jetting process.
Allow me to refine your perception.
First, not all pod brands are the same or offer equivalent restriction qualities among the general class of "pods".
Some pods allow more air to pass at high RPMs (like red line and above), when inlet air speeds are high. More air, more O2, can get you more power.
At lower inlet air speeds they simply reduce the vacuum levels in the carbs throats, which, in turn, have less suction draw on internal fuel jets.
Therefore to compensate, the orifices must be enlarged to draw the SAME amount of fuel the old jets delivered with a higher carb throat vacuum.
At low inlet velocities, the engine displacement and cam efficiency determine the air volume consumed. Inlet restriction here plays a non-significant role in 02 delivery, but a significant role in carb throat vacuum.
The only RPM range that PODS can improve power is at or near red line where the main jet dominates the fuel mixture. If you plan to flog your motor at these high RPMS regularly, then pods may provide some benefit.
Anyone have a CB550 motor with pods and still getting 40-50MPG? I suspect, many bikes with pods are over jetted, with the misconception that big jets automatically equal more power. In reality, it often just makes the motor far less efficient.
OK, one more question, is there a less restrictive stock filter replacement?
Yes, the UNI NU-4055 is a drop in foam replacement. I do not know how much it improves the airflow at and above Red line RPMs. It does slightly lean the carb mixtures in the lower RPMs. But, not so much that rejetting has been required. I'm not sure about 550's with PD carbs, though. With these bikes, the exhaust type becomes and important factor.
Cheers,
