yeah I would go ahead that replace the wires if you want to spend the money on them........but if there is no problem with them than I would just leave them as is.........but yeah......the back plugs are a bitch to change........I changed them on my V6 and it took me about 45minutes to and hour to change the back ones while the front three only took like 5 minutes

......again........its up to you......if you do the ohm test as suggested and the pass..........than let them be.........if not replace them with the spark plugs

...good luck