Very, very easy install-simple hand tools only! The hardest part is putting on the foam surround for the heat shield. I took out all of my intake bellows, but you can leave it in there if you like.
I recommend you get the package deal from everything G35. As stated, it comes with everything, including a decent set of instructions:
http://www.g35parts.com/9083/o...d=114
Have fun with the install...doing the work is half the fun of mods!