Go for it! It looks soooo much better!

I've lowered my cars for the last 15 years and the G35 is the best of the bunch! It rides almost like stock, which is very surprising to me.

The worst riding cars I've ever lowered were a 2001 GTP and my 99 Trans Am...the GTP bounced all over the place and the Trans Am "jarred my fillings loose"

 

lower it, but like i tell everyone else do it right dont just put springs on it...it really doesnt improve performance you cant tell the difference unless you are a really good driver IMO. Get sway bars coilovers cambers toes and arms. I dont see why you need to lower it unless you just want it for looks.

If you want to lower it i got a set of tien h-techs at my house that are still in the box ill sell them for 130 shipped.