BB engine

The BB is a type of Wankel rotary engine. It costs $8,000. It is the stock engine for Mazda RX-7 and Mazda RX-7 cabriolet but it can't be swapped in any other car. It makes 617 hp fully upgraded.

Trivia

 * The BB's real-world counterpart is the Mazda 13B-DEI engine.