My daily driver is a 92 sc300 5 speed. I just bought a jdm twin turbo motor. Has anyone done this conversion, and what kind of problems will I run into. It came with a wireing harness and computer for a automatic. I have a non turbo 2jz motor on my shelf. So I can take parts from that. So far I know I have to extend the harness, and change the water pump. What about a down pipe, can I use one from a US, 2jz turbo.