will this go on my g40?
It will yes, but will need work getting it there.
Have a search through the forum as there is some good information about Eaton conversions.
If youve got a BIG bundle of cash burning a hole in your pocket, do it. You'll need a bracket machining to hold the eaton in place, suitable drive for the belt (toothed pulleys), larger intercooler (eatons run hotter than G-laders) and most of all, a suitable map to run it with.
(http://i965.photobucket.com/albums/ae140/jonjong40/IMG_0757.jpg)
Mine ;)
Thats a Grand sight that Jon.
Fred.