The highly-anticipated, next-generation Toyota Supra is still a few months away from breaking cover, but a leaked, internal BMW document just revealed what engines it will use. Posted by the folks over at the Supramkv forums, the document confirms that the Supra will get the same three engines as the upcoming Z4. The lineup will consist of a four-cylinder unit with two power ratings and a more powerful six-cylinder mill for the range-topping model. These engines carry the familiar x0i nomenclature seen on BMW models. Specifically, the four-cylinders are dubbed 20i and 30i, while the six-cylinder is codenamed the 40i.