It sounds a lot like a VR6 but with a much more open exhaust. It has a light flywheel and has been dry sumped, otherwise the engine is effectively stock. He had a turbo kit picked out and was working on finding the additional cooling to allow more horsepower but last fall, after something like four years of perfect reliability, the engine would only run occasionally. He's been through ECU's, dashes, all sort of sensors, but no luck. Sometimes it runs for 1 minutes, other times it runs for 1 hour, but it always quits eventually. The car is about 2000 lbs and has 50/50 side to side and 45/55 front to rear weight ratios. It handles very well, being full tube frame it's more race car than mini.