Bad Pony posted this on a thread one time...
Oh, ok... yeah the main bumper is just 4 big bolts, but the cover will have to come off to do it. Removing the bumper cover isn't that hard really though. I've done it several times. First thing is that you'll have to remove all six lights...headlights, corners, inners. Then there are rivets on top, like right above the headlights... you'll have to drill them out, there's like 16 or 17 of them. You'll need a rivet gun and rivets to re-install the cover later. Then there are nuts, that attach the bumper cover to the fenders, to remove on the inside of the sides. If you reach your hand (with wrench) through the cracks on the sides, like where the air-filter is on a CAI kit, you can get most of them from the top. The lower ones you'll have to lay on the ground and get them from the bottom. I can't remember how many exactly, maybe 6 or 7 per side. That's pretty much it, the cover should just pull away from the car now. If you're not painting the cover, be really careful with it while it's off the car. Don't bend it around too much and be careful where you lay it down. Last time I did mine, I was going to paint it afterwards so I didn't care about the paint, but I layed it down in a part of my driveway that has gravel in it and it got all scratched up.
Like I said, the bumper it'self is just 4 big bolts and it will come right off. The foglight bracing bar installs in holes in the bumper that are on both GT and LX bumpers, no drilling required. I installed mine after the bumper cover was back on, but maybe doing it before installing the cover would be easier.
To re-install the cover, do the side nuts first. Tighten them finger tight, or loosely tightened, and then you can shift it and bump it around until it lines up with the fenders. Then tighten them. THEN do the rivets. If you do the rivets first, the cover can't be adjusted with the fenders afterwards. After all that, install the six lights and fog lights. If the car was originally a GT, the fog lights should be a "plug-and-play" type deal.
I think that's it. Hope this helps and good luck with it!