OK to get the A-Spec bumper off, first hit the car with a hammer and curse mitsubishi. Nah, just kidding, it's easy when you figure out where all the bolts are. Much easier than 300zx's.
First, take out your indicators. Then, look under your bumper, theres a bunch of what look like screws in big plastic washers. Unscrew them if you can, if not, just push a skinny flathead screwdriver into the screw part (NOT under the washer looking bit, or they can break) and pull out the screw part. Theres also some other bolts under there that connect the edges of the bumper to the bodywork.
Then, unbolt all of the inner guards that connect to the bumper.
Next, at the ends of the bumper that terminate at the wheel arch, you kind of have to wrangle some plastic part away from a bolt, and unbolt it. If it wasn't night time I would take a photo for you, but basically you have to force some plastic parts to undo that part of the bumper. Your bumper should now be hanging down at the back.
Now, the part which involves the swearing. First undo the nuts that are inside the indicator hole. Get a big long extension. Now, you will need an even longer extension if you want to do the last two bolts easily. About a foot long should be adequate (can't remember). If you have removed the headlights or jacked the front of the car up it's easy to see where they are, but basically these last 2 bolts are approximately level with the edge of the "VR4" grille, at the inside top of the bumper. If you stick your hand up in the underside of the bumper on the drivers side (easier side) you should be able to feel them.
Now, just pull your bumper off! It's easier with two people, you can pull evenly at the part where it connects into the chassis.
