Hello I am currently installing the 5efhe non asic into the ep91 which had a stock 4efe, its all bolted together nicely using the paseo 200mm clutch and flywheel, the wiring i am having done from another member on here hopefully. popular methods is just to use the full 5e block and swap the rest over from your 4e, you will need to fix the fueling because of the extra 200ccand get it on a dyno to watch out for knock/detonation but its quite a simple conversion. if your budget allows a e-manage blue I have the a halfcut which the 5e camefrom from so i will be using everything from the 5e, only because i have it but if you dont then the first method also works, hope this helps