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I believe you'll have to change or modify the ecu, you may have to re-locate a few of your liquid tanks in your hood (not certain about that), change your transmission, new intake, make sure the new engine has the wiring harnesses attached and have a lot of patience because any swap is a difficult task even if you have a shop working on it for you.
You will have to change MANY things, tranny, ecu, wiring harness but also (I don't remember the exact word in English) the two bars going from the gearbox to the wheels and I am sure that as you will be placing the engine you'll find more and more things to change. However in a way it is not a bad idea as I think (without being 100% sure) that the 3.0 engine is known to be much more reliable than the 4 cyl engine. On the other hand it might be easier to turbocharge your 4 cylinder engine... but I am sure some other people over here will be able to give you a more professional advice.
Maybe a good way to procede would be to go to a salvage yard and tell them you would need "everything to have a 6 cyl engine" so that if you need more stuff afterwards you could get back to him without having to pay more. I don't know, might be a bit dumb but it can be useful.
The swap is a lot of work, 14 hours of labor with three friends for just swapping the engines, and a week and a half at a custom wire shop to get it running.
Actually, I had a rear end damaged 98 V6 manual (1MV-FE), and i put it into my 92 I4 automatic (5FE-SE). I took the subframes from the fronts of each car and swapped them. They were bolt on. As for the brakes, I also swapped the rear subframes and now have the V6 braking system minus the ABS. These were bolt on as well. Everything fit exactly. In short, I4 auto to V6 manual in a 92 chassis with V6 suspension. I got pix as well, just no website yet.
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