Quote Originally Posted by HypnoToad
20b is 3rotor makes like 300HP N/A

then 26B is 4 rotor which makes 700HP N/A

20B from Mazda was rated at 280bhp twinturbo, but it *can* be deturbo'ed and tuned and make over 300 at the flywheel. It was never offered as a n/a motor.

26BR was Mazda's race only engine. Though a few people have mated 2 13B engines together, but it is still NOTHING like the 26BR which was capable of making well over 700hp, but was restricted to a little more then 500hp.