The most common engine you can swap these day would an LS engine, well, some people love the more reliable and magic ones, such as an RB26 engine that has been taken out of an R33 Skyline.
The R33 drivetrain has also been fitted in the GT86, and by the looks of it, the car seems to work fine. We have no idea what the power figures are, but judging by the big single turbo, we think the power output would be around 600 maybe 700 horses. This things is an absolute beast for sure, a true killer.