This has got to be one of the most unusual engine swaps ever seen in a golf cart. If you like the roar of a jet engine and 3 foot flames from the back of your cat then this is the upgrade for you. Hell to the neighbors, this is loud and in your face and is sure to upset a few people on the golf course.
The powerplant is a Solar Aircraft T-41 M-9 is an aircraft auxiliary power unit which was developed to provide power in the form of electricity as well as cabin heating and ventilation. This engine was usually placed in the tail section of planes as an APU and was designed in the late 40's/early 50's to be used in large aircraft. It provide auxiliary power when the main engines are not running, for example when parked at an airport terminal gate. The T41 engine was produced by the Solar Turbine company, a division of International Harvester.
This engine is a basic gas turbine that outputs around 50hp which is considerably more that a standard carts HP. Here's a writeup with more information and pictures of another of these T-41 jet engines being put back into working order.