If I recall right, it is by no means a perfect drop in. It takes quite a bit of fabrication unless you have all the U13 parts and most of the SE-R parts. I remember reading the cross member has to be modified, new mounts have to be put in, axles have to be made to fit the Hub of the Altima and SE-R tranny. It isn't that easy, just find a car that has an SR20 in it already, it makes life simple