Can you take an SRT-4 Engine and put it in a 2003 sx 2.0?

I have heard of people doing it and seen pictures, but I also hear it requires some modification to your car and the engine to get it to work. So yes you can, but it takes some skill to do it. I do not think it is cheap nor a quick change over. You might want google search the subject and find some good material on the subject before you start anything.