Lee Yearwood and his BMW E92 compete in Formula Drift ProSpec. Under the hood is a turbocharged 3.2 L Nissan RB-series inline-six. The motor is built with an RB30 block, Nitto stroker kit including forged rods and pistons, RB26 head, and nitrous system. It is capable of 1000+ hp but usually makes 850 hp for Formula Drift. Behind the motor is a RB25 five-speed transmission with a Speedtek 1-4 gear dogbox kit. From there power is sent to a Sikky Winters quick-change rear end with Driveshaft Shop axles. Listen to Lee explain the project to Larry Chen in the video below.
Source: Larry Chen