Ok, So I got the new trans it's a 5-speed out of an Si. I have been told that the transmission will bolt to the D15 block without a problem, so the only prob that I can forsee is the flywheel, clutch, and pressure plate from the initial 4-speed not being compatible with the new transmission. Does anyone know if this is a potential problem or is it simply bolt on easy? The guy I got the trans from didn't know if it was going to be a problem.