Hi Doug,
Yes, the INSIDE of the cylinder in slightly magnetic with the MAHLE (Nikasil)
cylinders. However, to my knowledge, the MAHLE cylinders have the "MAHLE" on the side of the cylinders similar to this:
If the cylinders are magnetic, but don't have the MAHLE markings.......I THINK they are MAHLE's?????
Hopefully, someone can clear this question up.
Regards,
P.S. My MAHLE's have the same markings as the one's in your photo.