I'm getting opposing information. Not having the product listed on the PAC site sux.
http://www.autosoundcentral.com/product_p/aoemnis2.htm
^^^ site says it "Works with the factory Bose and non-Bose systems on 1994-2007 Infiniti vehicles including the Infiniti G35"
Otherwise you would need to get a LOC (Line Out Converter) and tap into the wires going into the Bose amp. If your amp support line-level inputs then you can simply tap into the inputs prior to the Bose amp. As I've never owned that model G I'm not sure which is correct.
I'll reach out to Joe and have him pop in. I know he did this with his coupe.