I replaced my injectors with bigger ones, its not hard at all. The way I did it was I unplugged the MAF sensor, took the intake hose off the throttle body and set it asside still attached to the MAF and top of the air box. Unbolt the throttle body. Unbolt upper and lower intake manifolds. Next I think there is a small bolt on the back of the right fuel rail, its kinda hard to see, take that out, lossen (do not remove) the bolts that hold the cross pipe that connects the front of the two fuel railes together. no you have to lift the fuel rail off the injectors, it is easy to screw up the O ring on the top of the injector so be carefull. Unplug and pop the injectors out and your done.

*****MAKE SURE TO PUT MASKING TAPE OVER THE INTAKE HOLES SO NOTHING IS DROPPED INTO YOUR CYLINDERS AS SOON AS YOU GET THE INTAKE MANIFOLDS OFF******

Also there will be fuel spillage when you take the injectors off and when you loosen the cross pipe bolts.

I think thats about it, it should cover everything in the manual with pics.