Do you have an aftermarket downpipe? You need either a downpipe designed for the Evo3 O2 housing, or modify your existing downpipe. Also, whatever intake pipe you have *might* be too small, but I can't remember how much bigger the Evo3 compressor inlet is. It might not be so much as to require a different intake. Other than that, everything else should work.

you should replace your oil feed line & may wish to consider a new oil return as well. Otherwise a evo3 16g bolts in just as the fact one did.

using the evo 3 o2 housing will require some slotting of the downpipe flange holes to bolt up proper.

it's optional to remove the radiator. you WILL have alot more room to play with if you remove your radiator. Switching out the turbos was actually very easy. The first time I did it, it took my brother and I 5 hours, easily 3 if we didn't run into some small issues.

might hit the ECU imposed boost cut around 17-18psi.

update, since i had tubular manifold, the evo3 manifold had longer bolts but all the places are closed so tommrow after work ill be back at it.