idk, but that would be SWEET. but a 20b only came in like 1 mazda car and i think its in japan. 13b is what was in rx-7s
a 13b turbo might be more reasonable though, can still get pretty damn good numbers. FD rx7s had 13b which made 217hp stock. the FC engines (probably more common and had like 185hp.
http://www.rotarymiata.com/