1-420 is not worth modifying
2-car might have a problem arise that cant even be fixed at dealer.cu has to be flashed and car has eratic stutter.had one before.they say they have some type of recirculation kit but it might or might not solve problem.
3-4g63 na did not come in the 2g body.the only car that motor can be swapped in is the spyder with the 2.4l motor.
4-mitsubishi is basically same to maintain as a honda.