I decided to get any early start on it last night, and I can agree with you guys that its one B*&^% of a job!! How many things can possibly be bolted to the plenum...I think mitsubishi found out. The bolts on the back of the manifold were fine other than the one over by the emissions stuff, I could not get any leverage on it, and I was only able to use a 1/4 inch drive socket wrench since the head of the 3/8's was too big (it took about half an hour to finally break it loose). All those bolts on the rear are 12mm for future reference. If I remember correctly there are 3 attaching to some sort of mounting bracket and the other two are for the EGR.
I started out by taking the intake tubing out of the car...I must say you guys have it easy, that is the easiest intake I have ever taken off, its just one hose, one clamp around the TB, then just unclip the air box. After that I took the battery out of the car just to get more room on the distributor. After that I started taking out the 1 zillion bolts that hold eveything down. I found that everything I took off was either a 10mm or a 12mm, the sensor on the top of the plenum is held down by two 8mm bolts. And the plenum brace on the passenger side is held on by a 14mm. Anyway I finally took enough parts off of the manifold so that I could tilt it up towards the hood. I got the rear plugs changed and the wires run. Then the front was cake compaired to the rear. This is the point where I left off lastnight (it was 2:30 a.m.). Today I just need to try to remember where all the bolts and ground straps go
to get it back together. I am guessing it will take about another hour to get everything back together, so you guys were pretty good with your estimate of three hours, because I only have a little over 2 hours in the job...two + painful hours and cut up hands.
Also something worth noting is that you guys do have coolant lines running thru the bottom of your TB, so you may want to be carful you do not mess those up when you are changing the plugs. Luckily they seem to have enough play to get the job done with out taking them off.
I'll try to post again when I am actually finished the job, so I can add some more helpful info for anyone else trying to do plugs and wires them selves.