What vehicle was the 20b stock in? I am assuming it was never released here in the states?

 

It came in the Japanese-only JC Cosmo, which was a luxury car with twin turbos and an automatic transmission. Racing non-turbo 3-rotor engines were also available from Mazda Motorsports.

You can get more info on the JC Cosmo on these sites. Note that the last two sites go down often, but keep trying because they are very good sites.
http://www.geocities.co.jp/MotorCity/6881/
http://www.monito.com/wankel/wankel.html
http://www.dmrh.com.au/
http://www.3rotor.com/

 

You the man evil!!

 

I must say, very nice to drive too.
I have one as an everyday (almost) driver.

 

I don't like you anymore! lol
I'd love a Cosmo, they're so nice, even the sport's w/ their cloth and 13B-RE's