2003 camry v4(2azfe) to v6(1mzfe)
 

I am most likely gonna need to replace my engine and was noticing that a v6 1mzfe is a good bit cheaper and would also make me happier...I think the computer/wiring harness would need changed??? What else would be problems or possible areas that need changed/updated?

2003 camry v42azfe to v61mzfe
 

hes a liar hahaha..

that would be nice idea to put that engine in the camry and make it rwd car...

Oh crap so the 4 cylinder is front wheel drive and the 6 goes to rear wheel drive?

The 1mzfe was offered as an option for Camry, not sure when it was replaced be the newer model V6.

You will also need a different trans beside computer and wiring.

The parts should drop into the car but suggest you find another 4 cylinder rather then try this engine/trans swap. A lot of work, money and it will lower the resale value of the car.