I have a GN1 and it is a nice piece. Takes about an hour or so to install plus the trimming of the rubber stuff. It is also a complete kit so you don't need to buy anything else.
I did have to go to a dual fan setup though as I was over heating a lor easier.
Once I did the fans the piping did not fit. I had to cut the 2 pipes that are 180* bends in the middle and weld in a straight piece of pipe to extend the piping around the fans.
Works like a charm now :biggrin:
I can get pics if anyone is interested.