Mark just read your reply...........I may not have the info above correct.....

Is the 20B pump housing almost the same as the 13B housing.......Separate

from the front cover ??.........Will the RX8 pump and housing then bolt to

the 20B (or 13B) "With minor mods" ??............  

My 20B has a 12A front cover, and some version of a 13B pump that pumps nearly 50 gpm at engine RPM of 6000.

Al