I just did a tranny swap in my 2000 si. i have a jdm b18c in and just put up a s80 lsd tranny- After we mounted the tranny up we were doing the timing and the motor just came to a abrupt stop. we pulled everything apart and started testing everything we could and found that the act pressure plate was coming into contact with something in the bell housing - i bolted a stock fly wheel and exedy stage one upgrade clutch in it and spins freely. We spent 3 days trying to figure what the was going on and why the clutch worked with my old tranny and not this one. the old tranny was an s4c.