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Looks like the Z1000 has them but the Ninja does not.
From Ash on Bikes:

From Ash on Bikes:
BPF forks gain advantage by reducing the speed range over which the damping fluid has to flow. Instead of having an internal cartridge, the whole of the fork leg effectively becomes the cartridge, so the piston can be much bigger: 37mm diameter on the new ZX-6R instead of 20mm diameter on the old model. This increases the area of the piston by almost three and a half times, and in turn that means it can flow more oil at lower pressures. Effectively the whole operating range of damping oil speed is reduced, and its rate of increase is decreased too, meaning the damping control is substantially improved in particular at lower suspension speeds, such as when the front end is beginning to compress under braking. There’s also a reduced danger of hydraulic lock, which reduces harshness on poor surfaces.