A drop, and either wheels with a decent offset/fitment or spacers. First thing I did. You'll also need a camber kit and likely new shocks to avoid excessive camber and tire wear.
If an 03~05 (VQ35DE engine), a plenum spacer is a very cost effective but minor performance improvement.
OK, as long as there really isn't a power decrease while driving I am fine with it. It looks/sounds cool (and I kept the stock intake just in case).
Before I add the next mod, is this a good idea: http://www.amazon.com/Motordyne-Plenum-Spacer-Basic-350Z/dp/B0040TCMU8/ref=sr_1_2?ie=UTF8&qid=1405050365&sr=8-2&keywords=jwt+pop+charger