I have a 85 350x that I want to really beef up. I also have a yfz450 that I have toyed with the idea of putting that engine in the 350x, but I really don't want to trash my already working yfz450. So I have looked through tons of threads and seen someone touched upon this subject on a 200 with a 9:1 compression ratio but if memory serves me right the 350x has a 8.5:1, which should work for a turbo. Now I have also read that the 400ex and 350x head pipes are really close to the same except you need to do just a little bit of cutting to get it to fit. I know about EFI and rigging up that stuff. I'm just wondering if it was possible or would a CR500 engine fit?? Just what different engines can you cram in it??? Any input will help out.