Test the GPR first. If you still need to change them, they are not too bad once you get the VC off. The passenger side is a pain. Check out the wiring and plugs while you are in there and replace anything that looks suspect.
To get a little more room on the passenger side there is a small rectangle box with a vacumme line going to it, that is bolted to the side of the air box with a couple of small srews. It may be covered with a piece of insilation but you can have it off in about 30 secounds and it will give you a couple more inches of room on the those back bolts. also look those valve cover connections over real good its pritty common for them to cause problems
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