Hi guys been reading a lot on here. I have a few questions. Changing engines because my sentra SE-R 2.5 crapped the bed. I want to put an altima 2.5 in my car but was wondering if these have the same problem as the sentras? If i decide to replace it with a 1.8 from a sentra do i need to replace the Emc? Or do i need to replace that part regardless? I want to get rid of the Pre-cat andway so that's not even a question, but what do i want to replace that with? If anyone has replaced this engine and could help me out here it would make it easier on me, right. I am sure i have more questios but right now can't think of any. Just sick about replacing it and the cost. I have my eyes set on one with a 2002 with 55k for 1600. No core swap or shipping either. Let me know, thanks for all your help.