I have a used set of high compression b20 pistons for sale, with a b20 and a b16 head they are 12.5 to 1 compression.
These guys go for close to 600 new. I would recommend replacing the rings as they do have about 5k miles on them. I am going turbo an do not need anymore. They are standard bore full floaters.
I would be happy to trade for a set of forged pistons for any b series, that are meant for turbo. B16, b18, b20 any bore too. I am in the process of building so I can make whatever you have work.

will sell outright if you want, make me a reasonable offer.

I have pics available if needed,

707 815 0529
text is preferred.

Ben