finally did mine, on a '08 5.6L, 81k miles. i was going to replace the radiator, but for now i'll just do the bypass. really didn't take too long, probably 10 minutes of actual work, but i did have to go back to the store to get another connector. originally i had gotten the 3/8th double barbed connector, but i couldn't really get it on -all- the way. maybe some of you can but i couldn't. plus the clamps i got were too small. so i had to go back and get the 5/16th double barbed connector
so, parts i used:
-2x 3/8ths rubber cap (get the 5/16ths if you can though, the 3/8ths is a hair too big)
-4x 5/16-? clamps
-1x 5/16 double barbed plastic connector
-10mm & 12mm sockets (you can use a large phillips head instead of the 10mm)
-pliers to unclamp the factory clamps
-plastic bottle to catch the few drips from the hoses
-big piece of cardboard to put under to catch anything you don't catch with the bottle
-nitrile gloves (optional)
i used some big clamps i have to try to pinch off the hoses going to the radiator. i guess they did their job since i only got maybe 1/4oz of fluid out.
so what i did was pull one hose off the radiator (doesn't matter which one), throw the rubber cap on the radiator side (it might still drip a couple drips without the clamp on yet, but it's really just 1-2 drips, you're not going to flood the floor with fluid) and then drain the little bit of trans fluid in that hose into an empty water bottle, then put the new clamp and connector on that side of the the hose. then do the exact same for the other side. then tighten the clamps. i also then uncapped both sides of the radiator, put a bottle on one side and put an air compressor on the other to blow out anything that was left. there was barely anything in there.
i didn't zip tie it or anything, doesn't seem like it gets in the way/touches anything.
also, so i've never changed my own oil in the pathfinder (always had awesome deals back in texas just to have it done, $20 for reg and like $70 for mobil1), so when i changed it myself when i did the bypass i noticed this nifty little piece of metal under the oil filter that keeps the dripping (mostly) off the frame and sway bar: