We are talking about cabin air filters not engine air filters...air flow for heat and AC not your cars RPM's. If you noticed almost all engine air filters look identical regardless of brand whereas cabin air filters vary greatly in terms of design, thickness, and the type of media.How do you know? If the square inch surface area is larger then that would not restrict.
And what doses "restrict" mean, 1500 RPM, 2500RPM, 5000RPM? At what throttle opening.