one thing to note about those kits for Y34's. another person on NicoForums installed a kit that looked like the one in the link and had to figure out how to appropriately fill a gap under the grill section since Japanese Y34 have a slightly different front end grill. Also, unless you are willing to install Japanese NISSAN genuine Y34 lights that are different from the US Infiniti light assemblies, there will be a strange gap. What's more, our US grills have a "beak" that is missing on the Japanes Y34's. therefore, the bumper will have an unfilled opening when fitted on our cars.
see this thread for the first authentic Autech Y34 kit fitted in the US... it's a nightmare IMO:
zerothread?id=272533
good luck on whatever you all decide.